Docs: Merge EE doc/user/admin_area to CE

See merge request gitlab-org/gitlab-ce!27869

Docs: Merge EE doc/development to CE

See merge request gitlab-org/gitlab-ce!27606

Docs: Merge EE doc/​user to CE

See merge request gitlab-org/gitlab-ce!27785

Docs: Merge EE doc/administration/monitoring to CE

See merge request gitlab-org/gitlab-ce!27784

Docs: Merge EE doc/​administration/​auth to CE

See merge request gitlab-org/gitlab-ce!27740

Docs: Merge EE doc/​user/project/milestones to CE

See merge request gitlab-org/gitlab-ce!27713

Docs: Merge EE doc/​user/project/clusters to CE

See merge request gitlab-org/gitlab-ce!27710

Docs: Merge EE doc/​user/discussions to CE

See merge request gitlab-org/gitlab-ce!27709

Docs: Merge EE doc/administration/operations to CE

See merge request gitlab-org/gitlab-ce!27704

Docs: Merge EE doc/​user/group to CE

See merge request gitlab-org/gitlab-ce!27702

Docs: Merge EE doc/​update to CE

See merge request gitlab-org/gitlab-ce!27654

Docs: Merge EE doc/​workflow to CE

See merge request gitlab-org/gitlab-ce!27622

Docs: Merge EE doc/​integration to CE

See merge request gitlab-org/gitlab-ce!27610

Docs: Merge EE doc/​customization to CE

See merge request gitlab-org/gitlab-ce!27604

Resolve "Sort by due date and popularity in both directions"

Closes #50926

See merge request gitlab-org/gitlab-ce!25502

Resolve "Include time window parameters in the URL query string"

Closes #59365

See merge request gitlab-org/gitlab-ce!27230

Cache current working directory to speed up Rubocop

Closes #61383

See merge request gitlab-org/gitlab-ce!28066

CE Backport of tracking uninstall button click

See merge request gitlab-org/gitlab-ce!28012

Add @katrinleinweber as German proofreader

See merge request gitlab-org/gitlab-ce!24331

Update Releases permissions docs

See merge request gitlab-org/gitlab-ce!27935

Guest users now can read releases, except for items related to source
code.

Releated:
  https://gitlab.com/gitlab-org/gitlab-ce/issues/56838
  https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27247

Set timezone as GMT in Jest config file

Closes #59952

See merge request gitlab-org/gitlab-ce!27738

Allow guests users to access project releases

Closes #56838

See merge request gitlab-org/gitlab-ce!27247

This is step one of resolving
https://gitlab.com/gitlab-org/gitlab-ce/issues/56838.

Here is what changed:
- Revert the security fix from bdee9e84.
- Do not leak repository information (tag name, commit) to guests in API
responses.
- Do not include links to source code in API responses for users that do
not have download_code access.
- Show Releases in sidebar for guests.
- Do not display links to source code under Assets for users that do not
have download_code access.

GET ':id/releases/:tag_name' still do not allow guests to access
releases. This is to prevent guessing tag existence.

Docs: Update docs related to CI variables

See merge request gitlab-org/gitlab-ce!27786