Upgrade Elastic Stack helm chart to 1.9.0

See merge request gitlab-org/gitlab!27011

To support more recent k8s versions

Remove ci_pre_post_pipeline_stages feature flag

See merge request gitlab-org/gitlab!27403

Document kibana deployment

See merge request gitlab-org/gitlab!25362

Add note to restart Gitaly when configuring Praefect

See merge request gitlab-org/gitlab!27024

Replace Ruby 2.1/2.2/2.3 with Ruby latest

Closes #195165

See merge request gitlab-org/gitlab!27268

Remove the git_push_execute_all_project_hooks feature flag

Closes #34241

See merge request gitlab-org/gitlab!27401

Make it easier to find links documentation

See merge request gitlab-org/gitlab!27278

Adding note on DAST security reports

Closes #27313

See merge request gitlab-org/gitlab!27363

docs: Add Pages troubleshooting for /etc/ssl/ca-bundle.pem

See merge request gitlab-org/gitlab!25570

Add Requirements navigation link & placeholder page

Closes #207845

See merge request gitlab-org/gitlab!27086

Fix roadmap epic bar title text in popover

See merge request gitlab-org/gitlab!27391

This *reverse* feature flag has been operating in production for at
least 6 months. It should be safe to remove.

Since there's no behaviour change with the removal of this flag, there
is no need for a changelog entry.

Fix remove special chars from snippet url_to_repo

See merge request gitlab-org/gitlab!27390

Add background worker to publish incident to status page

See merge request gitlab-org/gitlab!26717

Fix project moved message after git operation

Closes #205646

See merge request gitlab-org/gitlab!27341

Epic bars were incorrectly displaying the description
instead of the title

Secure partner onboarding

See merge request gitlab-org/gitlab!25926

Drop 'experimental' references to Puma

See merge request gitlab-org/gitlab!27303

Migrate ee/spec/javascripts/related_items_tree/ to Jest

Closes #118456 and #194302

See merge request gitlab-org/gitlab!27015

Introduce "Reader" abstraction for project import"

Closes #208870

See merge request gitlab-org/gitlab!26481

 - reader can read JSON files for further processing
 - its only implementation would be to read legacy(fat) JSON files
 - split Project::TreeLoader into dedup_legacy_reader and legacy_reader

Fixes stop_review job upon expired artifacts from previous stages

See merge request gitlab-org/gitlab!27258

Move #auto_resolve_prometheus_alert methods from EE to CE

Closes #210524

See merge request gitlab-org/gitlab!27335

Remove unnecessary noop dependencies

See merge request gitlab-org/gitlab!27291

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/194302
Closes https://gitlab.com/gitlab-org/gitlab/issues/118456

Add redirects to telemetry

See merge request gitlab-org/gitlab!27377

Restructure Vale configuration

See merge request gitlab-org/gitlab!27378

Reduce svg icon requests during rendering

Closes #31734

See merge request gitlab-org/gitlab!26974

Move diffs/components/app_spec to Jest

See merge request gitlab-org/gitlab!27234