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

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

Remove deprecation message for milestone tabs

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

Remove all references to Gitlab::CorrelationId

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

If user can push to docker then it can delete too

Closes #40096

See merge request gitlab-org/gitlab-ce!31796

Extends the permission of $CI_REGISTRY_USER to allow them
to delete tags in addition to just pushing.

https://gitlab.com/gitlab-org/gitlab-ce/issues/40096

We're reversing the deprecation due to user feedback

Make badging less confusing in quick actions doc

Closes #66886

See merge request gitlab-org/gitlab-ce!32515

Add suggested changes to docker build doc

Closes #66802

See merge request gitlab-org/gitlab-ce!32442

Add Danger bot development documentation

Closes #58192

See merge request gitlab-org/gitlab-ce!32506

This is overdue, and some of the suggestions are embarrassing, but
this is how we actually develop Danger today.

When updating group and project members, new system hooks
`user_update_for_group` and `user_update_for_team` will be executed.

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/12252

Remove area chart in favor of time series

Closes #66393

See merge request gitlab-org/gitlab-ce!32129

Expand textarea for CA cert in cluster form

See merge request gitlab-org/gitlab-ce!32508

Add X-GitLab-NotificationReason header to note emails

See merge request gitlab-org/gitlab-ce!32422

Backport EE changes for built-in project template test

See merge request gitlab-org/gitlab-ce!32358

Provide filename and line number for `class_eval`

See merge request gitlab-org/gitlab-ce!32500

This commit removes one RuboCop offense from its todo file.

The 'assigned' reason doesn't apply to notes, but the other two
can ('mentioned' and 'own_activity'), so we can still use this for note
emails.

Docs: Clarify config value true is a string

See merge request gitlab-org/gitlab-ce!32209

Gitlab CI Linter otherwise gives error `variables config should be a hash value of key value pairs`

Skip requesting diverging commit counts if no branches are listed

See merge request gitlab-org/gitlab-ce!32496

This fixes a regression where an underscore in labels no
longer worked:
https://github.com/knsv/mermaid/releases

Update Code-Quality.gitlab-ci.yml to use `only.refs`

See merge request gitlab-org/gitlab-ce!32394

[CE] Use atlassian-jwt-ruby gem

See merge request gitlab-org/gitlab-ce!32519

This allows overriding `only.refs` to something else if needed. 

Replace indexes for counting active users

See merge request gitlab-org/gitlab-ce!32538

Replace indexes for counting active users

See merge request gitlab-org/gitlab-ce!32538

Handle :9090 and 0.0.0.0:9090 listen_address formats

See merge request gitlab-org/gitlab-ce!32456

Prometheus listen_address can be in formats of :9090 and 0.0.0.0:9090.
But before these can be used to connect a project to Prometheus, they
have to converted into absolute URIs.

[ci skip]