Add a note about private_profile changes in 12.1

Closes #64613

See merge request gitlab-org/gitlab-ce!30772

Documentations for parallel execution strategy for Merge Trains

Closes #63369

See merge request gitlab-org/gitlab-ce!30661

This commit adds a documentation for parallel pipelines on merge
trains.

Fix typo

Add endsWith to polyfill

See merge request gitlab-org/gitlab-ce!30920

Link Metrics Reports from merge request docs

See merge request gitlab-org/gitlab-ce!30848

Use predictable environment slugs

See merge request gitlab-org/gitlab-ce!30551

Removes EE differences for issue boards

See merge request gitlab-org/gitlab-ce!30851

Added new ES rake task and troubleshooting step

See merge request gitlab-org/gitlab-ce!30681

Update lint.md to provide correct path for API call as per #58223

Closes #58223

See merge request gitlab-org/gitlab-ce!25703

Remove duplicate word in Issues feature page

See merge request gitlab-org/gitlab-ce!30919

Document all the available DAST variables

Closes gitlab-ee#10122

See merge request gitlab-org/gitlab-ce!30801

Add docs for GitLab.com subscription upgrades

See merge request gitlab-org/gitlab-ce!30910

Document interacting GitLab components and features

See merge request gitlab-org/gitlab-ce!30813

It's not uncommon that a single code change can reflect and
interact with multiple parts of GitLab codebase, making it
possible to break an existing feature.

This commit expands documentation in that regard for developers.

Set visibility level 'Private' for restricted Internal imported projects

See merge request gitlab-org/gitlab-ce!30522

With https://gitlab.com/gitlab-org/gitlab-ee/issues/12388 change going
live there is potential risk of breaking imports of 'Internal' projects.
This change makes sure if 'Internal' visibility level is restricted
all 'Internal' projects will be marked as 'Private'

See: https://gitlab.com/gitlab-org/gitlab-ce/issues/64311

Update numbered lists and enforce docs standards

See merge request gitlab-org/gitlab-ce!30218

Ensure that all numbered lists use only 1. and no other numbers.
Also ensure that numbered lists use proper spacing.

Add documentation for panel types

See merge request gitlab-org/gitlab-ce!30695

This adds documentation on how to add
area and single stat panel types for the
monitoring dashboards using custom yml
files

Clean up the Gitaly docs

Closes #64396

See merge request gitlab-org/gitlab-ce!30584

- Add missing path to Gitaly configuration
- Properly list steps for Gitaly configurations
- Move sections around

change BoardService in favor of boardsStore on board blank state of the component board

See merge request gitlab-org/gitlab-ce!30546

add stub to the boardsStore to spy on it and be able to use toHaveBeenCalledWith for the pre-defined labels test

If an environment slug is predictable given only the environment
name, we can use the environment slug earlier in the CI variable
evaluation process as we don't have to wait for the environment
record itself to be persisted.

Remove gitlab:ui:visual job

Closes #64666

See merge request gitlab-org/gitlab-ce!30918

Added mention of Quick actions

See merge request gitlab-org/gitlab-ce!30881

Added mention of autocomplete characters

See merge request gitlab-org/gitlab-ce!30877

Refactor check mentions for xss test

See merge request gitlab-org/gitlab-ce!30914

Add documentation for bulk editing issue milestones at group level

See merge request gitlab-org/gitlab-ce!30398