SSoT for administration/high_availability docs

Closes #64560

See merge request gitlab-org/gitlab-ce!30729

- Make sure we have type defined in the frontmatter
- Add troubleshooting sections where absent
- Meaningful intros where absent

SSoT for administration/auth docs

Closes #64559

See merge request gitlab-org/gitlab-ce!30727

- Make sure we have type defined in the frontmatter
- Add troubleshooting sections where absent
- Meaningful intros where absent

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/39964

Closes #39964

See merge request gitlab-org/gitlab-ce!30722

Fix broken vue i18n strings

See merge request gitlab-org/gitlab-ce!30753

Docs: Add more detail to sign-up restrictions

See merge request gitlab-org/gitlab-ce!30580

Document openstack object store configuration

See merge request gitlab-org/gitlab-ce!30659

Liek asked in gitlab-org/gitlab-ce#59501

Update markdown.md to remove typo, "test" was left in the documentation

See merge request gitlab-org/gitlab-ce!30752

Align container registry empty state with design guidelines

Closes #64249

See merge request gitlab-org/gitlab-ce!30502

Shortened descriptive text
Added copy button to code snippets

Move setCurrentBoard() from BoardsStoreEE to core  (CE-backport)

See merge request gitlab-org/gitlab-ce!30626

(cherry picked from commit 9cd745c65bcb51d615399e82d8b26ef5cce972e1)

Move setCurrentBoard() from BoardsStoreEE to core

See merge request gitlab-org/gitlab-ee!14643

Unquarantine Add Deploy Key test

See merge request gitlab-org/gitlab-ce!30756

Add an appropriate solution in QA E2E style guide example

See merge request gitlab-org/gitlab-ce!30761

A "bad" example was given, however no solution was provided
for fixing the bad example

Convert client_auth_method to a Symbol for quirked OmniAuth providers

Closes #64407

See merge request gitlab-org/gitlab-ce!30683

Make httpclient respect system SSL configuration

Closes charts/gitlab#1436

See merge request gitlab-org/gitlab-ce!30749

Migrate null values for users.private_profile column

See merge request gitlab-org/gitlab-ce!29888

- Background migration for changing null values to false
- Set false as default value for private_profile DB column

Port of 57538-normalize-users-private-profile-field to EE

See merge request gitlab-org/gitlab-ee!14300

- Background migration for changing null values to false
- Set false as default value for private_profile DB column

Reorder fields in boards schema to match EE

See merge request gitlab-org/gitlab-ce!30751