Resolve "Merge button does not appear after Rebase-ing"

Closes #47052

See merge request gitlab-org/gitlab-ce!23572

Fixed link in doc/ci/yaml/README.md

See merge request gitlab-org/gitlab-ce!23433

Refactor the only and except complex section

See merge request gitlab-org/gitlab-ce!23792

Docs: Let's Encrypt certificate for GitLab Pages

Closes #51979

See merge request gitlab-org/gitlab-ce!23777

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

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 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

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

Update changelog to include Merge Request ID and Author

Update changelog to include Merge Request ID and Author

**Why?**

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

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

Add name, author and sha to releases

See merge request gitlab-org/gitlab-ce!23763

Display reply field if resolved discussion has no replies

Closes #54330

See merge request gitlab-org/gitlab-ce!23801

Stop using HipChat in the ServicesController spec

See merge request gitlab-org/gitlab-ce!23774

Creates Vue component to render each release block

See merge request gitlab-org/gitlab-ce!23697

Resolve "Only prompt user once when navigating away from file editor"

Closes #55344

See merge request gitlab-org/gitlab-ce!23820

Upgrade Knative from 0.1.3 to 0.2.2

See merge request gitlab-org/gitlab-ce!23808

Fix deprecation: Passing ActiveRecord::Base objects to sanitize_sql_hash_for_assignment

See merge request gitlab-org/gitlab-ce!23818

Fix deprecation: Passing conditions to delete_all is deprecated

See merge request gitlab-org/gitlab-ce!23817

Adjust padding of .dropdown-title to comply with design specs

See merge request gitlab-org/gitlab-ce!23546

Fix Issue boards don't show milestone in issue details

See merge request gitlab-org/gitlab-ce!23813