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

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

- Add new page to group docs for bulk editing issues
- Add link to new section to group index
- Amend bulk editing page at a project level to remove issues from note

Create documentation for the manual sorting / re-ordering capability

See merge request gitlab-org/gitlab-ce!30795

Adds chaos endpoints to Sidekiq

Closes #64663

See merge request gitlab-org/gitlab-ce!30814

Add issue link to disabled JUnit reports

See merge request gitlab-org/gitlab-ce!30912

Fix QA documentation to refer to perform method

See merge request gitlab-org/gitlab-ce!30872

The documentation referred to the .act method
This MR changes this to refer to the preferred
.perform method

CE port for milestones should not be set on epics issue promotion

See merge request gitlab-org/gitlab-ce!30633

Fix bug in dashboard display of closed milestones

Closes #59381

See merge request gitlab-org/gitlab-ce!30820

Enable RuboCop syntax linting in haml-lint

Closes #64753

See merge request gitlab-org/gitlab-ce!30903

This allows the chaos endpoints to be invoked in Sidekiq so that this
environment can be tested for resilience.

The refactor consists in:
- Better scopping preconditions and the test definition
- Removing a variable that was being used in a single palce, and
use the string directly instead.

Fix broken handling for outdated test repos

See merge request gitlab-org/gitlab-ce!30893

Update usage ping cron behavior

See merge request gitlab-org/gitlab-ce!30842

Improves add_timestamps_with_timezone helper

See merge request gitlab-org/gitlab-ce!30720

This improves the `add_timestamps_with_timezone` helper by allowing the
column names to be configured. This has the advantage that unnecessary
columns can be avoided, saving space.

A helper for removing the columns is also provided, to be used in the
`down` method of migrations.