The configuration is currently only specified in CI, by moving it into
`.mdlrc` we get immediate feedback locally in supported editors.

To ensure `mdl` is available it's also added to the `Gemfile`, though
CI will still use the version installed in the `gitlab-docs-lint` image.

Use Rugged if we detect storage is NFS and we can access the disk

See merge request gitlab-org/gitlab-ce!29725

Reduce N+1 queries in MergeRequestsController#ci_environment_status

See merge request gitlab-org/gitlab-ce!30224

Remove minimum required characters for fuzzy search if no trigram is used

See merge request gitlab-org/gitlab-ce!29810

Removes EE differences for app/views/admin/users/show.html.haml

Closes gitlab-ee#12533

See merge request gitlab-org/gitlab-ce!30407

Resolve "Removing an image via Web IDE shows binary data"

Closes #60856

See merge request gitlab-org/gitlab-ce!30314

- This enables us to use a scope to query all clusters in group
hierarchy order in one query, and also enables us to union to instance
clusters later.

- Handle case where clusters not present at level. In which case the
query should go ahead and return the next level's clusters.

- Swap with new CTE query behind Feature flag. This FF is default
disabled.

This improves query performance of
MergeRequestsController#ci_environments_status a lot.

However this means old deployments that deployed to kubernetes clusters
with prometheus installations will no longer show performance metrics as
we cannot backfill cluster_id from deployment_platform with certainty
(clusters may be edited/added/deleted, which changes the results of
deployment_platform).

Prevent amplification of ReactiveCachingWorker jobs upon failures

Closes #64176

See merge request gitlab-org/gitlab-ce!30432

This release includes continued improvements to the library, fixes for a
number of lexers and support for three new languages:
https://github.com/rouge-ruby/rouge/releases