Update dependency @gitlab/ui to v20.9.1

See merge request gitlab-org/gitlab!40401

Move "Add Approver" Name Validation Error into Form

See merge request gitlab-org/gitlab!39389

add release notes content section to feature template

See merge request gitlab-org/gitlab!39751

The release notes section is used by the release post item generator
https://about.gitlab.com/handbook/marketing/blog/release-posts/#release-post-item-generator

Merge branch '219788-replace-gl-deprecated-button-with-gl-button-in-app-assets-javascripts-environments' into 'master'

Resolve "Migrate environments pin button"

Closes #219788

See merge request gitlab-org/gitlab!38891

Use embed_dropdown for snippets

See merge request gitlab-org/gitlab!39885

Refactor pipeline new form to use controller

See merge request gitlab-org/gitlab!40109

We'll want to abstract this out to a prop
on the GitLab UI component

- Also removes old blob_embeddable since it
isn't used anymore
- Also adds a temporary gl-dropdown-text-py-0
utility class which we can remove when some
upstream components have been updated

Add status_issue rspec tags for plan tests

See merge request gitlab-org/gitlab!40056

Update E2E best practices for blurring elements

See merge request gitlab-org/gitlab!39866

Reset namespace name if CACHE_NAMESPACE_NAME is false

See merge request gitlab-org/gitlab!40085

Use existing group for project and existing project for runner
to avoid creating new resources

Documentation : Fix gitlab.rb filename reference

See merge request gitlab-org/gitlab!40118

Remove GlDeprecatedButton button

Closes #219853

See merge request gitlab-org/gitlab!40156

Omit sub-groups from trial eligibility

See merge request gitlab-org/gitlab!40300

Remove duplicate content

See merge request gitlab-org/gitlab!40158

Quarantine templating variables for metrics dashboards

See merge request gitlab-org/gitlab!40383

Docs: Update Elasticsearch with metadata and changes

See merge request gitlab-org/gitlab!40296

Update gitlab-puma to 4.3.5-gitlab-3

See merge request gitlab-org/gitlab!40389

Missing word in Sidekiq troubleshooting docs

See merge request gitlab-org/gitlab!40307

Mention Merged Results for forked projects in code review docs

See merge request gitlab-org/gitlab!40309

Resolve "Expose Alert via Issues Type"

Closes #240874

See merge request gitlab-org/gitlab!40214

Use Lookahead

Migrate deprecated create epic button in epic tree

Closes #219770

See merge request gitlab-org/gitlab!40143

Add invite email experiment

See merge request gitlab-org/gitlab!39628

This creates an experiment for a new invite email design that is
simpler for our users and only has one call to action instead of
multiple. In the first iteration, this is only for new users and
we're tracking how many more users accept the invitation with
the new design compared to the old one.

Fix unchecking all compliance frameworks on MR approvals settings

See merge request gitlab-org/gitlab!40070

Speed up metrics dashboard annotation policy specs

See merge request gitlab-org/gitlab!40260

Link back to full external PSQL config steps

See merge request gitlab-org/gitlab!40315

Simplify docs on enable Elasticsearch integration

See merge request gitlab-org/gitlab!40062

Docs: Updated capitalization of runner

See merge request gitlab-org/gitlab!40031

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/233529