Remove duplicates from issue related merge requests

See merge request gitlab-org/gitlab-ce!27067

Resolve "Improve diff nav header"

See merge request gitlab-org/gitlab-ce!26557

Add Feature Flag Permissions Frontend

See merge request gitlab-org/gitlab-ee!10096

Remove duplicates returned by Issues#related_merge_requests API that
relies on ReferencedMergeRequestsService which returns 2 arrays one of
related MRs and one of related MRs that close the issue(i.e. a subset
of first one). We only need related MRs in this case so just pick the
first array.

- Compare versions header is full width except in the unified diff mode
with no tree sidebar
  - Bar is always full width, but the content within stays centered when
unified and no tree sidebar
- File header is the same height as the "Compare versions header"
- aligns with the design system grid guidelines => 56px
- Diff file headers use a button group, switch icon order to open file
externally being the last option, all buttons will become icon buttons
(icon delivery by @dimitrieh)
- If a file header becomes sticky no rounded corner/double border
problem is visible anymore

Rename environment variable EE to IS_GITLAB_EE

Closes #60080

See merge request gitlab-org/gitlab-ce!27044

Move allow developers to create projects in groups to Core

See merge request gitlab-org/gitlab-ce!25975

Add columns to store project creation settings

Add project creation level column in groups
 and default project creation column in application settings

Remove obsolete line from schema

Update migration with project_creation_level column existence check

Rename migrations to avoid conflicts

Update migration methods

Update migration method

Rename environment variable EE to IS_GITLAB_EE (EE-port)

Closes gitlab-ce#60080

See merge request gitlab-org/gitlab-ee!10616

Move allow developers to create projects in groups to Core

See merge request gitlab-org/gitlab-ee!10057

Regenerate gitlab.pot

Closes #10955

See merge request gitlab-org/gitlab-ee!10624

Merge branch '5067-geo-don-t-mark-sync-as-successful-if-repo-does-not-exist-because-of-some-problems' into 'master'

[Geo] Don't mark sync as successful if repo does not exist because of some problems

Closes #5067

See merge request gitlab-org/gitlab-ee!10578

Serverless backend now uses `gitlabktl` tool

Closes #56252 and #58058

See merge request gitlab-org/gitlab-ce!26926

Upgrade Gitaly to v1.33.0

See merge request gitlab-org/gitlab-ce!27065

If an environment is protected, and a user cannot modify it, they should
not be able to update/delete feature flags on that environment, nor can
they rename, edit, or delete the feature flag.

Unify Gitlab::Access calls

Modify migration

Fix leftover

Unify Gitlab::Access calls

Update user creates project spec

Update user creates project spec to check
if there are groups in the namespace dropdown

Satisfy rubocop linters

Add project creation field to form

Update controllers to accept new param

Add project creation field to form

Add new conditions to group policy

Add new policies to group, update specs and settings

Add specs for project creation level in group model

Update groups edit view to update project creation level

Update groups edit view to update project creation level
 and add specs to check if the new settings are save

Update migration with project_creation_level
 column existence check

Update api settings spec with project creation level

Rename migrations to avoid conflicts

Update schema file

Clean access class from project creation ee feature

Remove project creation feature from group controller

Remove project creation level from EE factory

Update docs to reflect changes

Remove call to not existing file

Clean specs from calls to not existing file

Change called method to new one, in non EE directory

Update schema after migration

Remove code not needed in EE

Remove not needed line

Remove not needed lines

Clean up ee files from project creation level

Remove project creation level from ee group policy

Remove project creation level from ee group settings spec

Remove not needed parts of user class

Remove code from ee version of namespace helper

Modify doc file

Update namespace helper

Add to namespace helper method respecting
project creation level, update relevant files

Update new project spec

Update new project spec to check if
there are groups in the namespace dropdown

Update user creates project spec

Update user creates project spec to check
if there are groups in the namespace dropdown

Remove files

Remove spec files connected to the feature
that was moved from ee to ce

Update docs to get read of conflict

Satisfy rubocop linters

Make sure right method is in the right place

Add settings to default

Add postres only option to specs

Update migration methods

Update migrations method

Add changelog entry

Remove EE remarks from doc

Refactor method to avoid disabling linters

Update migration method

Add if clause to old migrations

A secondary node marks every sync as successful if the repository
does not exist. While it's OK for the majority of the cases it
does not take into account some possible problems with
NFS servers availability.
To make more precise decisions we could make use of repository checksum.
If one exists but the repo doesn't, it's an indicator that
something is wrong with the infrastructure.

Add color util classes for backgrounds and text

See merge request gitlab-org/gitlab-ce!26898

Update stylelint error formatter@1.0.2

See merge request gitlab-org/gitlab-ce!26860

Add text and background css classes

See merge request gitlab-org/gitlab-ee!10588

Merge branch 'ce-9262-move-project-search-bar-into-modal-dialog-on-operations-dashboard-page' into 'master'

CE backport: Add reusable project_selector component

See merge request gitlab-org/gitlab-ce!25036

Merge branch '9262-move-project-search-bar-into-modal-dialog-on-operations-dashboard-page' into 'master'

Resolve "Move project search bar into modal dialog on Operations Dashboard page"

Closes #9262

See merge request gitlab-org/gitlab-ee!9260