Revert "Merge branch 'winh-merge-request-related-issues' into 'master'"

See merge request !12354

```
[Vue warn]: Invalid prop: type check failed for prop "idKey". Expected
Number, got String.
```

We now fail on Vue warnings,
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12163/

[ci skip]

See https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2012

Clean up Vue warnings in tests

Closes #33624, #32965, and #33622

See merge request !12163

Merge branch '33734-transient-karma-failure-on-master-for-date-time-utils-timefor-returns-remaining-time-when-in-the-future' into 'master'

Resolve "Transient karma failure on master for `Date time utils timeFor returns remaining time when in the future`"

Closes #33734

See merge request !12227

Resolve "Transient karma failure on master for `Date time utils timeFor returns remaining time when in the future`"

Fix hover style for emoji button on parallel diff view

Closes #33865

See merge request !12281

Fix note highlight being added when you don't have a URL fragment hash #note_xxx

Closes #33916

See merge request !12293

Fix issue description syntax highlighting and math rendering

Closes #33877

See merge request !12282

Update rainbow from 2.1.0 to 2.2.2.

See merge request !12289

Update paranoia from 2.2 to 2.3.1.

See merge request !12288

Remove implicit dependency on `gitlab_sign_in` assigning to a user instance variable

See merge request !12296

Update carrierwave from 1.0.0 to 1.1.0.

See merge request !12291

We shouldn't be using instance variables in specs to begin with, and
depending on this implicit behavior of `gitlab_sign_in` would have made
it more difficult to change to `sign_in` where possible.

...we've also gone ahead and changed to `sign_in` where possible.

Prepare for bypassing GitLab sign in in feature specs

See merge request !11913

[EE] Prepare for bypassing GitLab sign in in feature specs

See merge request !2140

Enable autocomplete on project snippets -- EE merge edition

See merge request !2174

Not sure why this fails with the full login flow, but it's not necessary
and would've been changed eventually anyway, so whatever!

Change `logout_direct` uses to `gitlab_sign_out_direct`

Change single `login_via` use to `gitlab_sign_in_via`

Always use a explicit true/false value to set highlight because jQuery
assumes `null` means toggle from whatever state and doesn't force false.

Regressed in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12098

Restored missing function inside dropzone_input.js

Closes #33836

See merge request !12279

Enable autocomplete on project snippets

Closes #33911

See merge request !12286