Groups tree enhancements

Closes #40533

See merge request gitlab-org/gitlab-ce!15980

Avoid leaving a push event empty if payload cannot be created

See merge request gitlab-org/gitlab-ce!16214

Handle Gitaly aborted merge due to branch update

Closes gitaly#854

See merge request gitlab-org/gitlab-ce!16116

Include integration tests in CE/EE testing documentation

See merge request gitlab-org/gitlab-ce!16139

Add support for max_count option to Git::Repository#count_commits

See merge request gitlab-org/gitlab-ce!16145

Use a background migration for migrating issues.closed_at

See merge request gitlab-org/gitlab-ce!16083

Improve closed/merged events queries performance on Projects::MergeRequestsController#show.json

See merge request gitlab-org/gitlab-ce!15642

41054-Disallow creation of new Kubernetes integrations

Closes #41054

See merge request gitlab-org/gitlab-ce!16017

Resolve "Resizable file list and commit panel"

Closes #40042

See merge request gitlab-org/gitlab-ce!16178

Use heredoc for long strings so it's easier to read

See merge request gitlab-org/gitlab-ce!16179

Fix API endpoints to edit wiki pages where project belongs to a group

Closes #40453

See merge request gitlab-org/gitlab-ce!16170

If the payload cannot be created for some reason, we could be left with a nil
push event payload, which causes Error 500s when viewing the dashboard. Guard
against this error and log when it happens.

Avoids problems seen in #38823

Merge branch '37843-ci-trace-ansi-colours-256-bold-have-no-css-due-wrongly-ansi2html-light-color-variant-conversion-feature' into 'master'

fix issue #37843

Closes #37843

See merge request gitlab-org/gitlab-ce!15902

Update Auto DevOps template

See merge request gitlab-org/gitlab-ce!16042

Updates documentation for Prometheus and Kubernetes integration

Closes #41432

See merge request gitlab-org/gitlab-ce!16156

Handle GitLab hashed storage repositories using the repo import task

Closes #39870

See merge request gitlab-org/gitlab-ce!16027

Resolve "reStructuredText rendering of definition lists"

Closes #13355

See merge request gitlab-org/gitlab-ce!16202

Pre commit prettier

See merge request gitlab-org/gitlab-ce!16061

Move 2FA disable button #35836

Closes #35836

See merge request gitlab-org/gitlab-ce!16177

Re-add width for sidebar context header

See merge request gitlab-org/gitlab-ce!16180

- Removed disable button from /profile/account
- Added disable button to /profile/two_factor_auth
- Changed 2FA breadcrumb from 'User Settings > Account > Account' to 'User Settings > Account > Two-Factor Authentication'