Update CHANGELOG.md for 12.8.0

[ci skip]

changelogs/unreleased/37725-request-test-reports-on-demand.yml

----
-title: Test reports in the pipeline details page will now load when clicking the tests
-  tab.
-merge_request: 24577
-author:
-type: changed

changelogs/unreleased/37745-optimize-pipelines-finder.yml

----
-title: Fix query performance in PipelinesFinder
-merge_request: 21092
-author:
-type: performance

changelogs/unreleased/38096-splitmr-add-resource-milestone-events-table-pd.yml

----
-title: Add migration to create resource milestone events table
-merge_request: 23965
-author:
-type: added

changelogs/unreleased/38103-collect-release-evidence-at-moment-of-release-end-date.yml

----
-title: Collect release evidence at release timestamp
-merge_request: 23697
-author:
-type: added

changelogs/unreleased/38297-knative-domain-name-endpoint-section-links-to-invalid-doc.yml

----
-title: Fix broken link to documentation
-merge_request: 23715
-author:
-type: fixed

changelogs/unreleased/38319-rename-interfaces-cycle-analytics-to-value-stream.yml

----
-title: Rename cycle analytics interfaces to value stream analytics
-merge_request: 23427
-author:
-type: changed

changelogs/unreleased/39042-filter-merge-requests-approved-by-user-backend.yml

----
-title: Filter merge requests by approvals (API)
-merge_request: 21379
-author:
-type: added

changelogs/unreleased/39075-error-level-color.yml

----
-title: Indicate Sentry error severity in GitLab
-merge_request: 23346
-author:
-type: added

changelogs/unreleased/39462-cloud-run-mislabeled-on-gke-cluster-creation-form.yml

----
-title: Rename Cloud Run on GKE to Cloud Run for Anthos
-merge_request: 23694
-author:
-type: other

changelogs/unreleased/39474-unable-to-view-project-audit-events-statement-timeouts.yml

----
-title: Add index to audit_events (entity_id, entity_type, id)
-merge_request: 23998
-author:
-type: performance

changelogs/unreleased/39505-extend-the-ability-to-clone-a-dashboard-so-it-would-copy-the-custom.yml

----
-title: Extends 'Duplicate dashboard' feature, by including custom metrics added to
-  GitLab-defined dashboards.
-merge_request: 21923
-author:
-type: added

changelogs/unreleased/39509-todos-should-not-depend-on-gitaly-calls.yml

----
-title: Prevent unnecessary Gitaly calls when rendering comment excerpts in todos and
-  activity feed
-merge_request: 23100
-author:
-type: performance

changelogs/unreleased/39531.yml

----
-title: Update styles for pipeline status badge to be correctly vertically centered
-  in project pipeline card
-merge_request:
-author: Oregand
-type: fixed

changelogs/unreleased/42640-move-generic-alerts-endpoint-to-core.yml

----
-title: Makes the generic alerts endpoint available with the free tier
-merge_request: 23339
-author:
-type: changed

changelogs/unreleased/42646-include-issues-created-in-gitlab-on-sentry-error-details-page.yml

----
-title: Include issues created in GitLab on error tracking details page
-merge_request: 23605
-author:
-type: changed

changelogs/unreleased/43659-single-path-for-general-settings.yml

----
-title: Deprecate /admin/application_settings in favor of /admin/application_settings/general. The former path is to be removed in 13.0.
-merge_request: 22252
-author: Alexander Oleynikov
-type: changed

changelogs/unreleased/460-protected-branches-api-search.yml

----
-title: Add search support for protected branches API
-merge_request: 24137
-author:
-type: added

changelogs/unreleased/55487-backfill-lfs-objects-projects-sql.yml

----
-title: Backfill LfsObjectsProject records of forks
-merge_request: 24767
-author:
-type: other

changelogs/unreleased/9425-gitlab-npm-registry-to-support-npm-tags.yml

----
-title: NPM dist tags will now be displayed on the package details page.
-merge_request: 23061
-author:
-type: added

changelogs/unreleased/DFredell-master-patch-45053.yml

----
-title: Add a link to the variable priority override section from triggers page
-merge_request: 25264
-author: DFredell
-type: other