"Allow milestones to be associated with releases" BE

See merge request gitlab-org/gitlab-ce!30816

Modified schema via migrations.
Added one-to-one relationship between the two models.
Added changelog file

Add not null constraints to prometheus_metrics table columns

Closes #66663

See merge request gitlab-org/gitlab-ce!32339

Use new location for helm charts repo

See merge request gitlab-org/gitlab-ce!32563

Expose `name` and `merge_request_event_type` in serialized json and predefined variables

See merge request gitlab-org/gitlab-ce!32323

Skip set_repo_refs to speed up the tests

See merge request gitlab-org/gitlab-ce!32556

Skip set_repo_refs to speed up the tests

See merge request gitlab-org/gitlab-ee!16027

Resolve "gitlab.pot needs regenerating"

Closes #14690

See merge request gitlab-org/gitlab-ee!16035

Make error flash notification sticky

See merge request gitlab-org/gitlab-ce!30141

This commit also unifies layout structure
and remove no_container flag

Make error flash notifications sticky

See merge request gitlab-org/gitlab-ee!14797

This commit also unifies layout structure
and remove no_container flag

Update EpicsSelect dropdown to use Vuex

Closes #13714

See merge request gitlab-org/gitlab-ee!15639

Add feedback verbiage to guided tour exit routine

Closes #2

See merge request gitlab-org/gitlab-ee!15109

- We want to be able to collect user feedback data from the tour
  upon exit.  This will enable us to better analyze user experiences
  from the on-boarding process and adjust our process as necessary.
- Fix typo on welcome page
- we need to track feedback as a state in order to properly
  transition from exit tour to feedback to actually exiting

Add system hooks for project/group membership updates

Closes gitlab-ee#12252

See merge request gitlab-org/gitlab-ce!32371

Backport retries options for cancel_running

See merge request gitlab-org/gitlab-ce!32525

This commit adds pipeline.type key to PipelineEntity.
This key will be used in MR widget in the next iteration.

Cancel redundant pipelines in merge train when reconstruction happens

Closes #12996

See merge request gitlab-org/gitlab-ee!15450

Bump reliable fetcher

See merge request gitlab-org/gitlab-ce!32565

Stub DetectRepositoryLanguagesWorker for all tests

See merge request gitlab-org/gitlab-ce!32430

It performs an expensive operation, but isn't required in
most of tests

Stub DetectRepositoryLanguagesWorker for all tests

See merge request gitlab-org/gitlab-ee!16024

Remove deprecation message for milestone tabs

See merge request gitlab-org/gitlab-ce!32252

Use Security Dashboard in pipelines view

See merge request gitlab-org/gitlab-ee!15682

This [replaces][1] the Split Security Reports app with the Security
Dashboard in the pipelines view. This is part of a larger effort to
[move security reports logic to the backend][2].

This is behind the `pipeline_report_api` feature flag, which is
currently disabled by default.

A few other related changes were made:

- Old references to "timeline" were replaced with "history" in specs
- DRY in some specs regarding state initialisation
- Make the history and count endpoint props optional on the dashboard
  component, which, if missing/empty, disable the display of the counts
  and charts components
- Fixes a rendering discrepancy in the vulnerability modal, which was
  displaying a `File: undefined` row

[1]: https://gitlab.com/gitlab-org/gitlab-ee/issues/13496
[2]: https://gitlab.com/groups/gitlab-org/-/epics/1425

Remove all references to Gitlab::CorrelationId

See merge request gitlab-org/gitlab-ce!32228