Add support for relative ordering between classes for epics and epic_issues

Closes #13633

See merge request gitlab-org/gitlab!17800

Allow rows in file table to be opened in new window

See merge request gitlab-org/gitlab!19228

Add missing bottom padding in CI/CD settings

Closes #30204

See merge request gitlab-org/gitlab!19284

Merge branch '32801-pipeline-by-external-pr-from-github-mirror-on-12-3-has-no-user-permissions-to-use-include' into 'master'

Ensure pipeline by External PR from GitHub Mirror starts with a user

See merge request gitlab-org/gitlab!19072

Pipelines are created without an user if current_user is nil
and the pipeline triggerer is listed as API.
With this commit the pipeline triggerer will fallback to the
mirror_user that set up the project.

Share groups with groups (BE)

See merge request gitlab-org/gitlab!17117

It's implemented in a similar fashion as sharing a project with a
group.

Add @iamphill to CODEOWNERS file

See merge request gitlab-org/gitlab!19356

Fix errors in GraphQL Todos API due to missing TargetTypeEnum values

See merge request gitlab-org/gitlab!19052

Add endpoint for a group's vulnerable projects in the API

See merge request gitlab-org/gitlab!15317

* Adds `/group/:group_id/-/security/vulnerable_projects` which returns a
    list of the group's projects with vulnerabilities
* Adds Vulnerabilities::Occurrence.batch_count_by_project_and_severity
    which batch loads vulnerability counts grouped by severity and by
    project
* Adds Group#vulnerable_projects which returns a list of the group's
    vulnerable projects
* Adds VulnerableProjectSerializer and VulnerableProjectEntity, which
    exposes a vulnerability count method for each severity
* Adds VulnerableProjectPresenter which creates the vulnerability count
    method exposed in VulnerableProjectEntity

https://gitlab.com/gitlab-org/gitlab-ee/issues/11190

Allow management_project_id to be unset

See merge request gitlab-org/gitlab!19330

Remove empty Github service templates from db

See merge request gitlab-org/gitlab!18868

When creating a new Github integration, it looks for a service
record of the same type, but with the template flag set to true,
and clone its attributes before presenting the record to the user.

`https://gitlab.com/gitlab-org/gitlab/merge_requests/15737/diffs`
added `static_context` as a default attribute on for
this service but it clashes with the empty template on .com.

This commit removes Github templates that have `nil` or `{}`
as properties, allowing new services to set the `static_context`
default value from the code.

- and code & specs improvements

- and improve specs

Adds support for interspersed reordering between
epics and issues.

- add support for ordering of objects
from 2 different classes

Enforce global default project and snippet visibilities to private

Closes #35013

See merge request gitlab-org/gitlab!19188

Reuse PathIdSeparator constants

See merge request gitlab-org/gitlab!19299

Dynamically set db pool size in Puma

Closes #32562

See merge request gitlab-org/gitlab!19286

Before Puma, we had 1 rails process talk to the database
at any given time, which meant a connection pool size of 1
was sufficient to support that model. With Puma and its worker
thread pool, there can now be many threads simultaneously
trying to talk to the database. This change makes sure that
we allow the db pool size to scale along with the maximum
number of worker threads configured.

Make arrow buttons work within search box

See merge request gitlab-org/gitlab!18685

Fixes a bug where hidden.bs.dropdown was manually triggered
but the dropdown was not actually hidden. Triggering the event
caused the event handlers to be unloaded. The events are supposed
to be attached again when the dropdown is opened but in this case
the dropdown is still open.

Resolve "Update expired trial copy"

Closes #34717

See merge request gitlab-org/gitlab!18962

Refactor tree controls into Vue

Closes #34794

See merge request gitlab-org/gitlab!19065

Merge branch '35175-post_deployment_migration-generator-should-use-same-timezone-settings-as-rails-database' into 'master'

Resolve "post_deployment_migration generator should use same timezone settings as rails database migrations"

Closes #35175

See merge request gitlab-org/gitlab!19316

- in order to match rails migration timezone settings

Merge branch '20825-controller-boards-issuescontroller-update-executes-more-than-100-sql-queries' into 'master'

Remove query limit whitelist for Boards::IssuesController#update

Closes #20825

See merge request gitlab-org/gitlab!19307

Fix ref switcher not working on Microsoft Edge

Closes #31373

See merge request gitlab-org/gitlab!19335

Improve support for graceful shutdown on Puma/Unicorn

See merge request gitlab-org/gitlab!19223

Quarantine failing test

See merge request gitlab-org/gitlab!19343

Adds discussion to the optimistic design response

See merge request gitlab-org/gitlab!19297

This prevents a warning from occouring when we upload a design