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

Remove gitlab:ui:visual job

Closes #64666

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

Small refactor to GeoNodeStatus and remove disabled cop

See merge request gitlab-org/gitlab-ee!13441

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

And make use of `attribute_method_suffix '_timestamp'` to define
conversion from Date to Integer (and back) only once.

More and smaller methods to load Geo status data.

And use attribute method instead.

Create a helper function that defines the method for the percentages
instead of typing the same piece of code over and over again.

Don't put code in large if blocks, but do an early return instead.