Enable customizable_cycle_analytics feature flag

See merge request gitlab-org/gitlab!27418

Resolve "Export via streaming serializer, introduce "Writer" abstraction"

Closes #208803

See merge request gitlab-org/gitlab!26501

Merge branch '210268-replace-underscore-with-lodash-for-ee-app-assets-javascripts-threat_monitoring' into 'master'

Replace underscore with lodash for threat_monitoring components

Closes #210268

See merge request gitlab-org/gitlab!27175

Add API endpoints for Group Activity Analytics

See merge request gitlab-org/gitlab!26460

Add inline file coverage view for merge request diffs

Closes #3708

See merge request gitlab-org/gitlab!21791

Remove sub_group_webhooks feature flag

See merge request gitlab-org/gitlab!26070

Merge branch '5164-default-roadmap_graphql-and-unfiltered_epic_aggregates-feature-flags-to-on' into 'master'

Default :roadmap_graphql and :unfiltered_epic_aggregates feature flags to on

See merge request gitlab-org/gitlab!26919

Add docs for Group Activity Analytics API

See merge request gitlab-org/gitlab!27392

Ensure events on designs are visible to the appropriate users

Closes #198120

See merge request gitlab-org/gitlab!26708

Add application limits for Ci::PipelineSchedule

Closes #29566

See merge request gitlab-org/gitlab!27004

Adds application limits for Ci::PipelineSchedule models.

We're going to limit them to 10 per project for free users and 50 per
project for all paid plans.

Support opt-in sidekiq-cluster in bin/background_jobs script

See merge request gitlab-org/gitlab!27042

Add paid signup tracking events

See merge request gitlab-org/gitlab!26811

Run Sidekiq Cluster supervision on Core

See merge request gitlab-org/gitlab!27249

Drop uniqueness validation of project_key

See merge request gitlab-org/gitlab!27323

GraphQL: Allow creation of Requirement

See merge request gitlab-org/gitlab!26998

These are present in another MR, but for now include them here
and then rebase.

Create and style the vulnerability status badge

See merge request gitlab-org/gitlab!24847

Update documentation for pre/post stages

See merge request gitlab-org/gitlab!27410

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.