Add latest changes from gitlab-org/gitlab@master

changelogs/unreleased/api_services_index_endpoint.yml

----
-title: New API endpoint GET /projects/:id/services
-merge_request: 21330
-author:
-type: added

changelogs/unreleased/backward-compatibility-for-background-migrations.yml

----
-title: Make BackgroundMigrationWorker backward compatible
-merge_request: 22271
-author:
-type: fixed

changelogs/unreleased/better-errors-from-extends.yml

----
-title: Add JSON error context to extends error in CI lint
-merge_request: 30066
-author:
-type: changed

changelogs/unreleased/burndown-optimisations.yml

----
-title: Performance improvements on milestone burndown chart
-merge_request: 22380
-author:
-type: performance

changelogs/unreleased/bvl-fix-mwps-api.yml

----
-title: Merge a merge request immediately when passing merge when pipeline succeeds
-  to the merge API when the head pipeline already succeeded
-merge_request: 22777
-author:
-type: fixed

changelogs/unreleased/bvl-gitaly-dynamic-deadline.yml

----
-title: Don't let Gitaly calls exceed a request time of 55 seconds
-merge_request: 21492
-author:
-type: performance

changelogs/unreleased/bw-board-sorting.yml

----
-title: Project issue board names now sorted correctly in FOSS
-merge_request: 22807
-author:
-type: fixed

changelogs/unreleased/cache-ref-names-in-discussion-endpoint.yml

----
-title: Reduce Gitaly calls needed for issue discussions
-merge_request:
-author:
-type: performance

changelogs/unreleased/cancel-merge-train-pipeline-when-dropped.yml

----
-title: Cancel running pipelines when merge request is dropped from merge train
-merge_request: 22146
-author:
-type: fixed

changelogs/unreleased/ci-resource-group-doc.yml

----
-title: Add 'resource_group' keyword to .gitlab-ci.yml for pipeline job concurrency
-  limitation
-merge_request: 21617
-author:
-type: added

changelogs/unreleased/ci-resource-group-model.yml

----
-title: Add Ci Resource Group models
-merge_request: 20950
-author:
-type: other

changelogs/unreleased/cluster-applications-0-4-0.yml

----
-title: Bump cluster-applications image to v0.4.0, adding support to install cert-manager
-merge_request: 22657
-author:
-type: changed

changelogs/unreleased/create-downstream-pipeline-in-same-project.yml

----
-title: Allow an upstream pipeline to create a downstream pipeline in the same project
-merge_request: 22663
-author:
-type: added

changelogs/unreleased/dast_mr_reports_feature_flag.yml

----
-title: Turns on backend MR reports for DAST by default
-merge_request: 22001
-author:
-type: changed

changelogs/unreleased/dblessing_update_net_ldap_gem.yml

----
-title: Update the Net-LDAP gem to 0.16.2
-merge_request:
-author:
-type: other

changelogs/unreleased/default-epic_new_issue-ff.yml

----
-title: Add ability to create an issue in an epic
-merge_request: 22833
-author:
-type: added

changelogs/unreleased/dennis-enable-code-review-analytics-by-default.yml

----
-title: Enable Code Review Analytics by default
-merge_request: 23285
-author:
-type: changed

changelogs/unreleased/deployment-validate-sha.yml

----
-title: Validate deployment SHAs and refs
-merge_request:
-author:
-type: fixed

changelogs/unreleased/deployments-api-filters.yml

----
-title: Filter deployments using the environment & status
-merge_request: 22996
-author:
-type: added

changelogs/unreleased/display-rules-without-approvers.yml

----
-title: Show regular rules without approvers
-merge_request: 21918
-author:
-type: fixed