Cleanup Scaling / HA docs page

Closes #205634, #205632, and #205635

See merge request gitlab-org/gitlab!25422

Fix dev vulnerabilities seeder

See merge request gitlab-org/gitlab!26169

Revert "Merge branch 'craigf/job-args-json-escape' into 'master'"

Closes #208501

See merge request gitlab-org/gitlab!26210

This reverts merge request !26075

Make operations/update_service_spec.rb dynamic

See merge request gitlab-org/gitlab!25253

Docs: add language declarations to code blocks

See merge request gitlab-org/gitlab!26206

This MR adds language declarations to several pages in the /user
subdirectory.

Docs: add language declarations to code blocks

See merge request gitlab-org/gitlab!26204

Add language declarations to code blocks

See merge request gitlab-org/gitlab!26203

Disable Marginalia line backtrace in production

See merge request gitlab-org/gitlab!26199

HTML tags don't always work

See merge request gitlab-org/gitlab!26177

Update diff line content on MR diffs to use actual HTML and not CSS element

See merge request gitlab-org/gitlab!24815

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/24815

Update basic SAML Azure screenshot

See merge request gitlab-org/gitlab!26192

Fix `setTimeout` references in `content_viewer_spec`

See merge request gitlab-org/gitlab!24897

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/24897

Adding code language declarations to the last round of files in
the API folder.

This commit adds more language declarations to code blocks in
the API documentation.

Stringify sidekiq job args in logs

See merge request gitlab-org/gitlab!26075

Move top-level Cycle Analytics to the group level

See merge request gitlab-org/gitlab!24773

Use new mail_room fork

See merge request gitlab-org/gitlab!25869

As mentioned in https://github.com/basecamp/marginalia/pull/93/files,
adding `:line` to the output of the Marginalia incurs some overhead
because a regexp on the backtrace has to be run on every SQL query. Only
enable this in development because we've seen it slow things down.

Identified in https://gitlab.com/gitlab-org/gitlab/issues/198694

Logs exit as JSON, then exits rather than simply crashing out

Resolve "Stop markdown caching of non-markdown Snippet content"

Closes #207976

See merge request gitlab-org/gitlab!25985

Migrate ee/spec/javascripts/issuable/components to Jest

See merge request gitlab-org/gitlab!26091

- Also moves the related_issuable_mock_data

Memoize loading of CI variables

See merge request gitlab-org/gitlab!26147

Migrate blob_bundle spec from Karma to Jest

Closes #194218

See merge request gitlab-org/gitlab!26134

Replace placeholder link on dependency proxy page

See merge request gitlab-org/gitlab!26092

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/26092

Geo: Show secondary-only setting on only on secondaries

See merge request gitlab-org/gitlab!26029

Move interest in contributing an app to the end of the app list

See merge request gitlab-org/gitlab!26180

Update GitLab Packages

See merge request gitlab-org/gitlab!26175

199134 - Update severity badges

See merge request gitlab-org/gitlab!25489