Previously imports would fail if a merge request note included a
suggestion with an
`ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection`
exception.

This was happening because suggestions were listed as a descendant of
merge requests, but this doesn't work because suggestions are directly
associated with notes, not merge requests, and that association is lost.
Rails also disallows creating intializing a has_many association through
a different object.

We fix this by making `suggestions` a child of `notes` within a merge
request. This doesn't fix previously broken exported project exports,
but new exports will work.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/65880

Splits auto-refreshing of MR widget into 2 requests:

- the one which uses etag-caching and invalidates the fields on change
- the one without caching

The idea is to gradually move all the fields to etag-cached endpoint

Prevent rewritting plain links as embedded

Closes #58494

See merge request gitlab-org/gitlab-ce!31489

Removes the feature flag that controls whether
metrics dashboard urls unfurl the metrics dashboard
charts.

Revert "Merge branch '65152-selective-highlight' into 'master'"

See merge request gitlab-org/gitlab-ce!31643

Resolve EE differences in the lib/ directory

See merge request gitlab-org/gitlab-ce!31582

Fix Sidekiq scheduling_latency_s

Closes #65748

See merge request gitlab-org/gitlab-ce!31650

This will help identify Sidekiq jobs that invoke excessive number of
filesystem access.

The timing data is stored in `RequestStore`, but this is only active
within the middleware and is not directly accessible to the Sidekiq
logger. However, it is possible for the middleware to modify the job
hash to pass this data along to the logger.

Remove KubernetesService integration

See merge request gitlab-org/gitlab-ce!31365

Remove label issue and MR counts from default API responses

See merge request gitlab-org/gitlab-ce!31543