Adds back missing CSS class that was breaking tests

* master: (66 commits)
  fix confidential border issue as well as confidential styles leaking on new MR
  Migrate force push check to Gitaly
  Add option to disable project export on instance
  Better categorize test coverage results
  Add option to disable project export on instance - db changes
  Better caching and indexing of broadcast messages
  Include the `is_admin` field in the `GET /users/:id` API when current user is an admin
  Document rspec-retry and rspec-flaky
  Fix cop description
  Retrieve and sync flaky specs report from and to S3
  Use a new RspecFlakyListener to detect flaky specs
  Fix formatting of patch_versions.md [skip ci]
  Enable Timecop safe mode
  Show error message for API 500 error in tests, and
  Fix merge request diff deserialisation when too_large was absent
  Delete correct key from `session` after authenticating using U2F
  Bumps omniauth-ldap gem version to 2.0.4
  Pending delete projects no longer return 500 error in Admins projects view
  Do not run the `ee_compat_check` job for stableish branches
  Update gitlab.po: Missing 'r' in "Fouché" that comes from "Fourcher" verb.
  ...

fix confidential border issue as well as confidential styles leaking on new MR

Closes gitlab-ee#3121

See merge request !13388

Migrate force push check to Gitaly

See merge request !13406

Fixes the correct import modal window not showing

Closes #36318

See merge request !13490

Adds missing unit tests for vue components: issue_note_awards_list; issue_note_body; issue_note_form;issue_note_spec

Add option to disable project export on instance

See merge request !13211

Fix formatting of patch_versions.md

See merge request !13503

Better categorize test coverage results

See merge request !13485

Enable Timecop safe mode

Closes #32004

See merge request !13498

Better caching and indexing of broadcast messages

Closes #31706

See merge request !13429

Include the `is_admin` field in the `GET /users/:id` API when current user is an admin

Closes #36213

See merge request !13501

Make Git revision dropdown style consistent

See merge request !13116

Pending delete projects no longer return 500 error in Admins projects view

Closes #35435

See merge request !13389

Detect and keep track of flaky specs

See merge request !13021

Also marks a few things as uncovered, and removes an unused class.

Delete correct key from `session` after authenticating using U2F

Closes #36096

See merge request !13499

Put back deleted tests

Caching of BroadcastMessage instances has been changed so a cache stays
valid as long as the default cache expiration time permits, instead of
the cache being expired after 1 minute. When modifying broadcast
messages the cache is flushed automatically.

To remove the need for performing sequence scans on the
"broadcast_messages" table we also add an index on (starts_at, ends_at,
id), permitting PostgreSQL to use an index scan to get all necessary
data.

Finally this commit adds a few NOT NULL constraints to the table to
match the Rails validations.

Fixes gitlab-org/gitlab-ce#31706