Development docs: move some docs content from Handbook and improve content/headings

See merge request gitlab-org/gitlab-ce!27399

Fix broken master due to pipeline cache refactoring

Closes #11172

See merge request gitlab-org/gitlab-ee!11041

Add badge-pill class on group member count

Closes #60026

See merge request gitlab-org/gitlab-ce!27019

Update dependency @gitlab/ui to ^3.3.0

See merge request gitlab-org/gitlab-ce!27321

Refactor review apps doco and CI landing page

See merge request gitlab-org/gitlab-ce!26886

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27334 broke EE
because an EE-specific port was not created. This commit moves
EE-specific code from the Sidekiq worker to a service object.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/11172

Fix remove_source_branch merge request API handling

Closes #60530

See merge request gitlab-org/gitlab-ce!27392

Users attempting to set merge requests to `remove_source_branch` to
`false` would encounter an Error 500 because the UpdateService and API
checked `present?`, which would always return `false`. We now just
use `has_key?` to decide whether the parameter is present.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60530

Move Subscriptions page to new path and improve content

See merge request gitlab-org/gitlab-ee!11026

Fix URL that causes test_external_links to fail

See merge request gitlab-org/gitlab-ce!27384

https://gitlab.com/gitlab-com/gitlab-docs/-/jobs/196921364

Properly expire all pipeline caches when pipeline is deleted

Closes #60469

See merge request gitlab-org/gitlab-ce!27334

Forbid the usage of reload

Closes #60218

See merge request gitlab-org/gitlab-ce!27125

EE: Forbid the use of `#reload` and prefer `#reset`

Closes gitlab-ce#60218

See merge request gitlab-org/gitlab-ee!10647

Remove multi-line suggestions feature flag

Closes #59178

See merge request gitlab-org/gitlab-ce!27219

Git FSCK has no timeout

Closes #53319

See merge request gitlab-org/gitlab-ce!27299

Add variable substitution in prometheus proxy API

See merge request gitlab-org/gitlab-ce!27226

- In prometheus proxy api, allow variables to be replaced. For example,
if 'up{env="%{ci_environment_slug}"}' is passed to the endpoint, it
becomes 'up{env="production"}' before being sent to prometheus.

Resolve "Insights charts should display all the periods even if there are no data for them"

Closes #11096

See merge request gitlab-org/gitlab-ee!10733

When deleting a pipeline, only some of the cache structures were being
expired, but not the full pipeline list. We have to synchronously
schedule a pipeline cache expiration because the pipeline will be
deleted if the Sidekiq expiration job picks it up. To do this, properly
extract all the logic buried in the Sidekiq worker into a service, and
then call the service.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60469

Split `.gitlab-ci.yml` into multiple includes

Closes #58521

See merge request gitlab-org/gitlab-ce!27116

EE: Split `.gitlab-ci.yml` into multiple includes

Closes gitlab-ce#58521

See merge request gitlab-org/gitlab-ee!10854

Resolve "Master broken related to tracing and sanitizing"

Closes #11161

See merge request gitlab-org/gitlab-ee!11000

Move to supporting multiple charts per page for Insights

Closes #10466 and #10720

See merge request gitlab-org/gitlab-ee!10516

- Config file change
  - No longer accepts single chart, array only
  - Display warning for old config detected
- Loads new charts upon tab change
  - Renders those successful
  - Flash message for errors
  - Summary of error instead of chart

Fix selection of scoped labels

Closes #11158

See merge request gitlab-org/gitlab-ee!10993

When sorting labels by user selection order, any missing labels
had index 0. If only single selected label was returned by UI,
then this label had index 0 too so it was not chosen as the "last
selected" label. To fix this, any missing labels have index -1.