Refactor the only and except complex section

See merge request gitlab-org/gitlab-ee!8837

Remove "Switching to Rails 5" documentation

See merge request gitlab-org/gitlab-ee!8867

EE port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23840

Removed rails 5 documentation

See merge request gitlab-org/gitlab-ce!23840

Remove Rails 4 support

See merge request gitlab-org/gitlab-ce!23717

Resolve a transient failure in MWPS feature spec

Closes gitlab-ee#6770

See merge request gitlab-org/gitlab-ce!23838

Remove Rails 4 support

Closes #8761

See merge request gitlab-org/gitlab-ee!8781

Because we removed rails 4 support, this document is not needed
anymore.

Remove CREATE_DB_USER variable in prepare_build

See merge request gitlab-org/gitlab-ce!23815

Update prettier.md with VSCode Settings section

See merge request gitlab-org/gitlab-ce!23810

When this spec is run in a certain order, there appeared to be a timing
issue with opening the "Merge when pipeline succeeds" drop-down menu. We
now explicitly wait for any pending requests to complete before clicking
the drop-down.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6770

Fix the database schema

See merge request gitlab-org/gitlab-ee!8864

Fix warnings in tests

See merge request gitlab-org/gitlab-ce!23788

Refactor Ci::Pipeline's config_sources enum

Closes gitlab-ee#8244

See merge request gitlab-org/gitlab-ce!23799

EE: Refactor Ci::Pipeline's config_sources enum

Closes #8244

See merge request gitlab-org/gitlab-ee!8842

Move description of cluster type to presenter

Closes #53771

See merge request gitlab-org/gitlab-ce!23789

Remove issue_suggestions feature flag

Closes #55166

See merge request gitlab-org/gitlab-ce!23723

**Why?**

This is a recurring issue that new team members keep running into.

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23763/ did not
include all changes in the schema, and when merged into EE the wrong
version number was used.

Add group based Maven API endpoint

See merge request gitlab-org/gitlab-ee!8798

doc/ci/yaml: improve wording to explain better deep vs recursive merging

See merge request gitlab-org/gitlab-ce!22542

Serverless Doc Updates

Closes #55089

See merge request gitlab-org/gitlab-ce!23640

All arguments passed to the `FeatureConstrainer` will be passed on to
the `Feature.enabled?` check.

Add dplanella as Catalan proofreader

See merge request gitlab-org/gitlab-ce!23827

Docs add empty space to render list

See merge request gitlab-org/gitlab-ce!23756

Docs: Align CE and EE k8s doc to match

Closes #54771

See merge request gitlab-org/gitlab-ce!23758

Docs: Align CE and EE k8s doc to match (EE Version)

See merge request gitlab-org/gitlab-ee!8809