Add index on ci_builds.updated_at

Closes #31251

See merge request !10870

Add a transaction around `move_issues_to_ghost_user`

See merge request !10465

Fix wrong link to GDK in README file

Closes #30817

See merge request !10701

Mention new mechanism to generate frontend fixtures

See merge request !10706

[#29801] Add "Slack Slash Commands" to API docs

Closes #29801

See merge request !10757

Update plantuml.md Fix wrong order when restarting tomcat service [ci skip]

See merge request !10855

Fix border color on activities page

Closes #31072

See merge request !10864

- While deleting a user, some of the user's associated records are moved to the
  ghost user so they aren't deleted. The user is blocked before these records
  are moved, to prevent the user from creating new records while the migration
  is happening, and so preventing a data race.

- Previously, if the migration failed, the user would _remain_ blocked, which is
  not the expected behavior. On the other hand, we can't just stick the block +
  migration into a transaction, because we want the block to be committed before
  the migration starts (for the data race reason mentioned above).

- One solution (implemented in this commit) is to block the user in a parent
  transaction, migrate the associated records in a nested sub-transaction, and
  then unblock the user in the parent transaction if the sub-transaction fails.

- Reorder slash command api requests, include slack response example
- Case fix and added changelog

submodule_links: handle urls that don't end with .git

See merge request !10799

[ci skip]

Reword backup & restore secrets description

See merge request !10753

Fix Git repository URL field on New Project page

See merge request !10803

Merge branch '31265-update-auto-deploy-documentation-for-postgres-and-private-project-support' into 'master'

Update Auto Deploy documentation

Closes #31265

See merge request !10859

Remove reference to burndown charts since they don't exist for ce.

See merge request !10861

fix placeholder visibility

Closes #30618

See merge request !10804

Use master_password for Sentinel

See merge request !10857

Start versioning cached markdown fields

Closes #30672

See merge request !10597

Refactor add_users method for project and group

See merge request !10850

discussions docs

See merge request !10390

- Move to dicsussions/index.md
- Bring back previous path with a link to new location
- Reorder sections

Fixed the preview keyboard shortcut focusing wrong tab

Closes #31101

See merge request !10849

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Now correctly tests against different forms

Based on !10841 Fix Error 500 when referencing issue with project in pending delete

Closes #31215

See merge request !10843

Refactor environments components into vue files - part 3

See merge request !10833

Fix user profile tabs showing raw json when navigating back and forward

See merge request !10352

Adding animation for all dropdown

Closes #26208

See merge request !8419