Our version of webpack's acorn is too old and throws errors when we are
not transpiling the optional chaining operators `?.` and nullish
coalescing operators `??` even though all our targeted browsers support
it.

Therefore we need to enable
[`@babel/plugin-proposal-optional-chaining`][0] and
[`@babel/plugin-proposal-nullish-coalescing-operator`][1] manually.

After we have updated to webpack@5, we can disable these plugins.

[0]: https://babeljs.io/docs/en/babel-plugin-proposal-optional-chaining
[1]: https://babeljs.io/docs/en/babel-plugin-proposal-nullish-coalescing-operator

Added .browserslistrc to some CI rules in order to trigger correct
pipelines.

When we [recently updated][0] our supported browser versions, we dropped
support for Safari < 13.0. Our docs state that we could drop support for
Safari 13.0 as well, while still supporting 13.1.

Safari 13.0 is barely used (and End of Life anyway) and dropping support
for it will allow us to remove polyfills for the [ResizeObserver API][1]
andto use the newer [Clipboard APIs][2].

[0]: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/63994
[1]: https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver
[2]: https://developer.mozilla.org/en-US/docs/Web/API/Clipboard

Changelog: changed

Change static docs links

See merge request gitlab-org/gitlab!65535

Build docs url for the GitLab Agent page using page path helper

Change filter wording for group import

See merge request gitlab-org/gitlab!65732

Schedule MergeRequestCleanupRefsWorker more efficiently

See merge request gitlab-org/gitlab!65647

Update link to blog post

See merge request gitlab-org/gitlab!66130

Change color of successful pipelines in charts

See merge request gitlab-org/gitlab!65987

Merge branch '333380-state-why-usage-ping-can-t-be-enabled-through-the-admin-area-when-disabled-via-config' into 'master'

Reword Service Ping admin area text when disabled by config

See merge request gitlab-org/gitlab!65588

Remove development feature flag `compliance_dashboard_drawer`"

See merge request gitlab-org/gitlab!65943

Updates rollout issue links to correct ones

See merge request gitlab-org/gitlab!66143

Fixed the header color in fly-outs for Dark mode [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!66138

Updated approval settings to use local form data to stop mutating outside the store

See merge request gitlab-org/gitlab!59887

[RUN ALL RSPEC] Fix specs to use new template defaults

See merge request gitlab-org/gitlab!66141

The default data_category was changed in
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66076

Changelog: fixed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66138

This converts the MergeRequestCleanupRefsWorker to be a limited
capacity worker.

The ScheduleMergeRequestCleanupRefsWorker will still be enqueuing
jobs but it'll be based on capacity. If there's no capacity then
no new jobs will be enqueued.

For now, we are capping it at 4 jobs at a time. This will be later
on be configurable.

This is still behind the merge_request_refs_cleanup feature flag
so we can easily turn it off on production while testing.

Changelog: changed

Respect absolute date user setting in MR widget

See merge request gitlab-org/gitlab!66045

Display full name of fork namespace

See merge request gitlab-org/gitlab!65203

Add "empty" scenario and refactor viewers spec

See merge request gitlab-org/gitlab!66009

Remove codequality_mr_diff_annotations flag

See merge request gitlab-org/gitlab!65960

Quarantine broken QA test

See merge request gitlab-org/gitlab!66125

Change default metric definition template category to Optional

See merge request gitlab-org/gitlab!66076

Add trial suffix to can_extend and can_reactivate methods in the Namespace class

See merge request gitlab-org/gitlab!66061

Update localTimeAgo to accept Arrays and NodeList

See merge request gitlab-org/gitlab!65851

Add Cluster Image Scanning to vuln scan details

See merge request gitlab-org/gitlab!65962

Fix escaped chars in remove and delete modals

See merge request gitlab-org/gitlab!65990

Merge branch '335269-snowflake-data-warehouse-downstream-impact-due-to-db_structure-changes' into 'master'

Resolve "Snowflake dwh impact due to db_structure changes"

See merge request gitlab-org/gitlab!65537

Exclude flaky example from review-qa-smoke job

See merge request gitlab-org/gitlab!65705

Upgrade GitLab Pages to 1.41.0

See merge request gitlab-org/gitlab!66033

Minor refinements and enhancements to Vale and Markdownlint rules

See merge request gitlab-org/gitlab!66035

The fix is not as simple as first thought.