Update CHANGELOG.md for 9.1.0

[ci skip]

changelogs/unreleased/12818-ci-status-as-favicon.yml

----
-title: Show CI status as Favicon on Pipelines, Job and MR pages
-merge_request: 10144
-author:

changelogs/unreleased/12818-expose-simple-cicd-status-endpoints-with-status-serializer-gitlab-ci-status-for-pipeline-job-and-merge-request.yml

----
-title: Expose CI/CD status API endpoints with Gitlab::Ci::Status facility on pipeline,
-  job and merge request for favicon
-merge_request: 9561
-author: dosuken123

changelogs/unreleased/17325-rugged-gem-update.yml

----
-title: Update rugged to 0.25.1.1
-merge_request: 10286
-author: Elan Ruusamäe

changelogs/unreleased/18471-restrict-tag-pushes-protected-tags.yml

----
-title: Tags can be protected, restricting creation of matching tags by user role
-merge_request: 10356
-author:

changelogs/unreleased/19742-permalink-blame-button-line-number-hash-links.yml

----
-title: Update permalink/blame buttons with line number fragment hash
-merge_request:
-author:

changelogs/unreleased/20841-getting-started-better-empty-state-for-merge-requests-view.yml

----
-title: Added merge requests empty state
-merge_request: 7342
-author: 

changelogs/unreleased/20914-project-home-width.yml

----
-title: Limit line length for project home page
-merge_request:
-author:

changelogs/unreleased/21451-allow-disable-mr-link.yml

----
-title: Add ability to disable Merge Request URL on push
-merge_request: 9663
-author: Alex Sanford

changelogs/unreleased/22303-symbolic-in-tree.yml

----
-title: Fix symlink icon in project tree
-merge_request: 9780
-author: mhasbini

changelogs/unreleased/23363-use-strong-params-in-wikis-controller.yml

----
-title: Update wikis_controller.rb to use strong params
-merge_request:
-author:

changelogs/unreleased/23655-api-group-issues.yml

----
-title: Fix API group/issues default state filter
-merge_request:
-author: Alexander Randa

changelogs/unreleased/23674-simplify-milestone-summary.yml

----
-title: Move milestone summary content into the sidebar
-merge_request: 10096
-author:

changelogs/unreleased/23862-fix-group-project-count.yml

----
-title: Adding non_archived scope for counting projects
-merge_request: 8305
-author: Naveen Kumar

changelogs/unreleased/24137-issuable-permalink.yml

----
-title: Link issuable reference to itself in meta-header
-merge_request: 9641
-author: mhasbini

changelogs/unreleased/24166-close-builds-dropdown.yml

----
-title: Prevent builds dropdown to close when the user clicks in a build
-merge_request:
-author:

changelogs/unreleased/24187-set-git-terminal-prompt-env-var-in-initializer.yml

----
-title: Set GIT_TERMINAL_PROMPT env variable in initializer
-merge_request: 10372
-author:

changelogs/unreleased/24215-closed-issues-board.yml

----
-title: Display all closed issues in “done” board list
-merge_request:
-author:

changelogs/unreleased/24240-add-monitoring-endpoints.yml

----
-title: Add /-/readiness /-/liveness and /-/metrics endpoints to track application health
-merge_request: 10416
-author:

changelogs/unreleased/24421-personal-milestone-count-badges.yml

----
-title: Add dashboard and group milestones count badges
-merge_request: 9836
-author: Alex Braha Stoll

changelogs/unreleased/24501-new-file-existing-branch.yml

----
-title: New file from interface on existing branch
-merge_request: 8427
-author: Jacopo Beschi @jacopo-beschi

changelogs/unreleased/24784-system-notes-meta-data.yml

----
-title: Add metadata to system notes
-merge_request: 9964
-author:

changelogs/unreleased/24861-stringify-group-member-details.yml

----
-title: Hide form inputs for group member without editing rights
-merge_request: 7816
-author:

changelogs/unreleased/25188-polyfill-es-symbol.yml

----
-title: Add ECMAScript polyfills for Symbol and Array.find
-merge_request: 10120
-author:

changelogs/unreleased/25332-make-file-templates-easy-to-use-and-discover.yml

----
-title: Remove no-new annotation from file_template_mediator.js.
-merge_request: !9782
-author:

changelogs/unreleased/25515-delegate-single-discussion-to-new-issue.yml

----
-title: Create a new issue for a single discussion in a Merge Request
-merge_request: 8266
-author: Bob Van Landuyt

changelogs/unreleased/25556-prevent-users-from-disconnecting-gitlab-account-from-cas.yml

----
-title: Prevent users from disconnecting GitLab account from CAS
-merge_request: 10282
-author:

changelogs/unreleased/26188-tag-creation-404-for-guests.yml

----
-title: Don't show links to tag a commit for users that are not permitted
-merge_request: 8407
-author:

changelogs/unreleased/26202-change-dropdown-style-slightly.yml

----
-title: Changed dropdown style slightly
-merge_request:
-author:

changelogs/unreleased/26236-monospace-gfm.yml

----
-title: Change gfm textarea to use monospace font
-merge_request:
-author:

changelogs/unreleased/26470-branch-names-with-reference-prefixes-results-in-buggy-branches.yml

----
-title: Strip reference prefixes on branch creation
-merge_request: 8498
-author: Matthieu Tardy

changelogs/unreleased/27114-add-undo-mark-all-as-done-to-todos.yml

----
-title: Add Undo mark all as done to Todos
-merge_request: 9890
-author: Jacopo Beschi @jacopo-beschi

changelogs/unreleased/27114-add-undo-to-todos-in-the-done-tab.yml

----
-title: Add Undo to Todos in the Done tab
-merge_request: 8782
-author: Jacopo Beschi @jacopo-beschi

changelogs/unreleased/27174-filter-filters.yml

----
-title: Prevent filtering issues by multiple Milestones or Authors
-merge_request:
-author:

changelogs/unreleased/27262-issue-recent-searches.yml

----
-title: Recent search history for issues
-merge_request:
-author:

changelogs/unreleased/27271-missing-time-spent-in-issue-webhook.yml

----
-title: Include time tracking attributes in webhooks payload
-merge_request: 9942
-author:

changelogs/unreleased/27293-remove-repeated-labels.yml

----
-title: Remove duplicated tokens in issuable search bar
-merge_request:
-author:

changelogs/unreleased/27503-feature-status-aria-labels.yml

----
-title: Add `aria-label` for feature status accessibility
-merge_request: 9830
-author:

changelogs/unreleased/27574-pipelines-empty-state.yml

----
-title: Adds empty and error state to pipelines
-merge_request:
-author:

changelogs/unreleased/27580-fix-show-go-back.yml

----
-title: Shows 'Go Back' link only when browser history is available
-merge_request: 9017
-author:

changelogs/unreleased/27878-new-service-for-creating-user.yml

----
-title: Implement user create service
-merge_request: 9220
-author: George Andrinopoulos

changelogs/unreleased/27910-admin-can-create-project-in-all-groups.yml

----
-title: Allow admin to view all namespaces
-merge_request:
-author: George Andrinopoulos

changelogs/unreleased/27988-fix-transient-failure-in-commits-api.yml

----
-title: 'Add `requirements: { id: /.+/ }` for all projects and groups namespaced API
-  routes'
-merge_request: 9944
-author:

changelogs/unreleased/28030-infinite-offset.yml

----
-title: allow offset query parameter for infinite list pages
-merge_request:
-author:

changelogs/unreleased/28187-project-name-cut-off-with-nested-groups.yml

----
-title: Use toggle button to expand / collapse mulit-nested groups
-merge_request: 9501
-author:

changelogs/unreleased/28402-fix-starred-projects-filter-wrong-message-on-no-results.yml

----
-title: Fix wrong message on starred projects filtering
-merge_request:
-author: George Andrinopoulos

changelogs/unreleased/28424-labels-support-color-names-in-backend.yml

----
-title: Labels support color names in backend
-merge_request: 9725
-author: Dongqing Hu

changelogs/unreleased/28494-mini-pipeline-graph-commit-view.yml

----
-title: Adds pipeline mini-graph to system information box in Commit View
-merge_request:
-author:

changelogs/unreleased/28574-jira-trigers.yml

----
-title: Remove confusing placeholder for JIRA transition_id
-merge_request:
-author:

changelogs/unreleased/28614-harmonious-color-palette.yml

----
-title: Update color palette to a more harmonious and consistent one.
-merge_request: 10154
-author:

changelogs/unreleased/28634-todos-margin.yml

----
-title: Remove extra margin at bottom of todos page
-merge_request:
-author:

changelogs/unreleased/28660-fix-dismissable-error-close-not-visible-enough.yml

----
-title: Fixes dismissable error close is not visible enough
-merge_request: 9516
-author:

changelogs/unreleased/28695-move-all-associated-records-to-ghost-user.yml

----
-title: Deleting a user should not delete associated records
-merge_request: 10467
-author:

changelogs/unreleased/28713-fe-style-guide.yml

----
-title: Adds Frontend Styleguide to documentation
-merge_request: 9961
-author:

changelogs/unreleased/28732-expandable-folders.yml

----
-title: Add back expandable folder behavior
-merge_request:
-author:

changelogs/unreleased/28799-todo-creation.yml

----
-title: Create todos only for new mentions
-merge_request:
-author:

changelogs/unreleased/28810-projectfinder-should-handle-more-options.yml

----
-title: ProjectsFinder should handle more options
-merge_request: 9682
-author: Jacopo Beschi @jacopo-beschi

changelogs/unreleased/28874-fix-milestone-issues-position-order-in-api.yml

----
-title: Order milestone issues by position ascending in api
-merge_request: 9635
-author: George Andrinopoulos

changelogs/unreleased/28899-linking-to-edit-file.yml

----
-title: Linking to blob edit page handles anonymous users and users without enough permissions
-  to edit directly
-merge_request:
-author:

changelogs/unreleased/28991-viewing-old-wiki-page-version-edit-button-exists.yml

----
-title: When viewing old wiki page version, edit button should be disabled
-merge_request: 9966 
-author: TM Lee

changelogs/unreleased/29014-create-issue-form-buttons-misaligned-on-mobile.yml

----
-title: Fix create issue form buttons are misaligned on mobile
-merge_request: 9706
-author: TM Lee

changelogs/unreleased/29043-upgrade-vue-and-remove-warnings.yml

----
-title: Upgrade VueJS to v2.2.4 and disable dev mode warnings
-merge_request: 9981
-author:

changelogs/unreleased/29046-fix-github-importer-open-prs.yml

----
-title: Fix GitHub Import deleting branches for open PRs from a fork
-merge_request: 9758
-author:

changelogs/unreleased/29116-maxint-error.yml

----
-title: Fix projects_limit RangeError on user create
-merge_request:
-author: Alexander Randa

changelogs/unreleased/29128-profile-page-icons.yml

----
-title: Add helpful icons to profile events
-merge_request:
-author:

changelogs/unreleased/29137-bulk-perform-async-should-specify-queue.yml

----
-title: Make authorized projects worker use a specific queue instead of the default one
-merge_request: 9813
-author:

changelogs/unreleased/29162-refactor-dropdown-milestone-spec.yml

----
-title: Refactor dropdown_milestone_spec.rb
-merge_request:
-author: George Andrinopoulos

changelogs/unreleased/29189-discussion-button.yml

----
-title: Fix alignment of resolve button
-merge_request:
-author:

changelogs/unreleased/29209-sign-up-form-name.yml

----
-title: Change label for name on sign up form
-merge_request:
-author:

changelogs/unreleased/29328-fix-transient-failure-in-model-user-spec.yml

----
-title: Add custom attributes in factories
-merge_request: 9892
-author: George Andrinopoulos

changelogs/unreleased/29341-add-metrics-button-env-overview.yml

----
-title: Add metrics button to environments overview page
-merge_request: 10234
-author:

changelogs/unreleased/29364-private-projects-mr-fix.yml

----
-title: Don’t show source project name when user does not have access
-merge_request:
-author:

changelogs/unreleased/29405-fix-project-wiki-update.yml

----
-title: Fix Project Wiki update
-merge_request: 9990
-author: Dongqing Hu

changelogs/unreleased/29414-fix-toggle-discussion-link-jump.yml

----
-title: Update toggle buttons to be <button>
-merge_request:
-author:

changelogs/unreleased/29428-new-directory-from-existing-branch.yml

----
-title: New directory from interface on existing branch
-merge_request: 9921
-author: Jacopo Beschi @jacopo-beschi

changelogs/unreleased/29432-prevent-click-disabled-btn.yml

----
-title: Fix project title validation, prevent clicking on disabled button
-merge_request: 9931
-author:

changelogs/unreleased/29438-fix-trigger-webhook-for-ref-with-dot.yml

----
-title: Fix trigger webhook for ref with a dot
-merge_request: 10001
-author: George Andrinopoulos

changelogs/unreleased/29469-message-for-project-x-will-be-deleted-should-include-namespace.yml

----
-title: Display full project name with namespace upon deletion
-merge_request:
-author:

changelogs/unreleased/29483-spam-check-only-title-and-description.yml

----
-title: Spam check only when spammable attributes have changed
-merge_request:
-author:

changelogs/unreleased/29492-useless-queries.yml

----
-title: Remove useless queries with false conditions (e.g 1=0)
-merge_request: 10141
-author: mhasbini

changelogs/unreleased/29550-fix-quick-submit-on-preview.yml

----
-title: Fix quick submit short-cut on preview tab for comments
-merge_request: 10002
-author:

changelogs/unreleased/29555-align-all-todo.yml

----
-title: align Mark all as done with other Done buttons on Todos page
-merge_request:
-author:

changelogs/unreleased/29575-polling.yml

----
-title: Adds polling utility function for vue resource
-merge_request:
-author:

changelogs/unreleased/29662-allow-unauthenticated-branches-api.yml

----
-title: Allow unauthenticated access to some Branch API GET endpoints
-merge_request:
-author:

changelogs/unreleased/29669-redirect-referer-params.yml

----
-title: Fix redirection after login when the referer have params
-merge_request:
-author: mhasbini

changelogs/unreleased/29670-jira-integration-documentation-improvment.yml

----
-title: Added clarification to the Jira integration documentation.
-merge_request: 10066
-author: Matthew Bender

changelogs/unreleased/29828-change-search-hint-in-new-filters.yml

----
-title: Change hint on first row of filters dropdown to `Press Enter or click to search`
-merge_request: 10138
-author:

changelogs/unreleased/29830-build-scroll-indicator.yml

----
-title: fix sidebar padding for build and wiki pages
-merge_request:
-author:

changelogs/unreleased/29843-project-subgroup-transfer.yml

----
-title: Correctly update paths when changing a child group
-merge_request:
-author:

changelogs/unreleased/2989-run-cicd-pipelines-on-a-schedule-idea1-basic-backend-implementation.yml

----
-title: Resolve "Run CI/CD pipelines on a schedule" - "Basic backend implementation"
-merge_request: 10133
-author: dosuken123

changelogs/unreleased/29897-remove-force-scroll-for-mr-changes-diff.yml

----
-title: Remove forced scroll into view when switching to Changes MR tab
-merge_request:
-author:

changelogs/unreleased/29929-jira-doc.yml

----
-title: Fix link to Jira service documentation
-merge_request:
-author:

changelogs/unreleased/29930-fix-profile-cover-button-a11y.yml

----
-title: Add tooltip and accessibility for profile cover buttons
-merge_request: 10182
-author:

changelogs/unreleased/29950-vue-pagination-icons.yml

----
-title: consistent icons in vue and kaminari pagers
-merge_request:
-author:

changelogs/unreleased/30008-textarea-focus.yml

----
-title: refocus textarea after attaching a file
-merge_request:
-author:

changelogs/unreleased/30021-api-deploy_keys-can_push-is-not-honoured.yml

----
-title: Enable creation of deploy keys with write access via the API
-merge_request:
-author:

changelogs/unreleased/30056-rename-milestones-empty.yml

----
-title: Removed Milestone#is_empty?
-merge_request: 10523
-author: Jacopo Beschi @jacopo-beschi

changelogs/unreleased/30112-fix-pipelines-sub-nav-highlight.yml

----
-title: Fix sub-nav highlighting for `Environments` and `Jobs` pages
-merge_request: 10254
-author:

changelogs/unreleased/30125-markdown-security.yml

----
-title: Remove the class attribute from the whitelist for HTML generated from Markdown.
-merge_request:
-author:

changelogs/unreleased/30195-document-search-param-on-api.yml

----
-title: Add search optional param and docs for V4
-merge_request:
-author: