Allow custom award emoji through the API

See merge request gitlab-org/gitlab!77478

Run `project.after_import` when GitLab Migration is complete

See merge request gitlab-org/gitlab!83966

Improve comments webhooks description

See merge request gitlab-org/gitlab!83981

Merge branch '355975-pause-the-execution-of-a-batched-background-migration-when-too-many-jobs-fail' into 'master'

Resolve "Fail the execution of a batched background migration when too many jobs fail"

See merge request gitlab-org/gitlab!82993

Geo: Use `git clone` for first sync instead of `git fetch`

See merge request gitlab-org/gitlab!77143

Add experiment context to click_video_link action in video experiment

See merge request gitlab-org/gitlab!84026

Set up initial GFM parser

See merge request gitlab-org/gitlab!83294

Add Storage Usage Email Notification Service

See merge request gitlab-org/gitlab!83222

Add temp index for notes without discussion_id

See merge request gitlab-org/gitlab!84038

This will be used for the background migration to backfill these rows

Changelog: other

Move active_users_project_repo metric to Snowplow

See merge request gitlab-org/gitlab!83795

Async SAML membership updates

See merge request gitlab-org/gitlab!83619

Feat(License): update license type names

See merge request gitlab-org/gitlab!83611

In one of the previous commits it's made possible to award custom emoji.
With this change they are properly shown on the frontend.

Changelog: added

For custom emoji there is source image URL. This change exposes that
through the award emoji API when it is available.

When validating award emoji, a custom emoji name is also valid.

The CustomEmoji factory was creating a namespace *and* a group, that
shouldn't have. Also the creator was set to nil by default, that's also
not good.

In 2d5b14e3 (Add CustomEmoji Banzai Filter, 2020-11-07) a first
iteration of rendering custom emoji in Banzai was added. That change
inserted <img> tags on the backend and made sure the frontend did not
clean them out.

This change modifies that and passes the fallback image source to the
frontend so it can insert <img> tags in frontend code.

Scope Geo replication details progress bar popup target by site ID

See merge request gitlab-org/gitlab!83637

Document that background migrations must be marked

See merge request gitlab-org/gitlab!83913

Background migrations with tracking enabled must be marked, because
this sometimes gets missed, add a review step to explicitly check
to make sure they've been marked as completed.

Changes the new jobs table cache config

See merge request gitlab-org/gitlab!82938

Initial add of database dictionary YAML files

See merge request gitlab-org/gitlab!83671

Document problematic data access patterns

See merge request gitlab-org/gitlab!83863

These formatting issues will break CI; let's fix them first and
separately.

Preload group root ancestor for Group Projects API

See merge request gitlab-org/gitlab!81838

Document how to add a new built-in project template

See merge request gitlab-org/gitlab!71472

- Move the bundle_repo script from
  https://gitlab.com/gitlab-org/project-templates/contributing
- Clean up documentation of contriobuting to the built-in templates.
  Mostly copy https://about.gitlab.com/community/contribute/project-templates/
  and refactor it to be more clear.

Changelog: other

Previously when a new SAML user signed in the default membership
was added synchronously. This caused performance issues for very
large groups as the project authorizations were inserted for
each project. The default membership is now managed asynchronously.
There's a small chance users won't see all projects in their list
immediately upon first sign in, but the Sidekiq jobs have high
priority and should finish quickly.

Changelog: fixed