Every browser which supports IntersectionObserver will now use it over
observing scroll and resize events. Older browsers without support fall
back on the previous behavior.

Additionally the MutationObserver can be enabled and disabled manually
via the helper method `startContentObserver` and `stopContentObserver`.
This might prove useful on pages where we manipulate the DOM
extensively.

Adds list_last_commits_for_tree as the method call for the Gitaly ListLastCommitsForTree RPC

Closes #37433

See merge request gitlab-org/gitlab-ce!21921

Keep IDE RightPane views alive

See merge request gitlab-org/gitlab-ce!21980

Fix link handling for issue cards.

Closes #48445

See merge request gitlab-org/gitlab-ce!21910

Implements list_last_commits_for_tree to communicate with the
ListLastCommitsForTree Gitaly RPC

Bumps the Gitaly server version

Bumps the Gitaly-Proto gem version

Update docs regarding frozen string

See merge request gitlab-org/gitlab-ce!22003

docs: clarify nothing special required for post-deployment migrations

See merge request gitlab-org/gitlab-ce!22000

Link to the tag from a version instead of commit

Closes gitlab-org/release/tasks#459

See merge request gitlab-org/gitlab-ce!22015

This will result in a 404 when running an unreleased security patch
while still allowing users to find the commit when it is made available.

Fix Error 500 when forking projects with Gravatar disabled

Closes #50254

See merge request gitlab-org/gitlab-ce!21985

Fix undefined format_options method in SchemaDumper for MySQL db

See merge request gitlab-org/gitlab-ce!21907

Skip creating auto devops jobs for sast, container_scanning, dast,…

See merge request gitlab-org/gitlab-ce!21959

Add notes about commits API to repository files documentation

See merge request gitlab-org/gitlab-ce!21876

Remove dropzonejs-rails (replaced by dropzone node module)

See merge request gitlab-org/gitlab-ce!17831

Fixed file templates not being fully fetched in Web IDE

Closes #51912

See merge request gitlab-org/gitlab-ce!21993

Resolve "Fill pipeline source for external pipelines"

Closes #51651

See merge request gitlab-org/gitlab-ce!21814

xref #47424.

Check frozen string in style builds

See merge request gitlab-org/gitlab-ce!21999

This also adds specs for 3 distinct situations:

2. When there is an unknown pipeline with just a build
3. When there is an unknown pipeline with no statuses
1. When there is an unknown pipeline with a build and a status

Docs: improve Pages overview (to deprecate feature page)

Closes #50507

See merge request gitlab-org/gitlab-ce!21798

**Why?**
- This is needed for the Web Terminal feature.
  https://gitlab.com/gitlab-org/gitlab-ee/issues/5426

**Notes:**
- Introduces a `pane` Vuex module.
- Some views should not be kept alive (i.e. job details).
  This is why a `keepAlive` flag was introduced for views.

# Conflicts:
#   Gemfile.lock

Closes #51912

[Docs] Document how to merge translations from Crowdin

See merge request gitlab-org/gitlab-ce!21924

Docs for Project/Groups members API with inherited members

Closes #51404

See merge request gitlab-org/gitlab-ce!21984

Add mysql_compatible_index_length to migration helpers

Closes #50253

See merge request gitlab-org/gitlab-ce!21852

Fix job_details.json schema

Closes #51927

See merge request gitlab-org/gitlab-ce!21983

closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51927

When Gravatar is disabled, the "no avatar" is used, which failed
to revert to the colorful identity icons for namespaces.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/50254

Clarify subgroup permissions

See merge request gitlab-org/gitlab-ce!21769

Expains the differences between `api/projects/:id/members` and
`api/projects/:id/members/all` related to inherited members.