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

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

- [x] Rename `login_as` to `gitlab_sign_in`
- [x] Rename `login_with` to `gitlab_sign_in_with`
- [x] Rename `login_via` to `gitlab_sign_in_via`
- [x] Rename `logout` to `gitlab_sign_out`
- [x] Rename `logout_direct` to `gitlab_sign_out_direct`
- [x] Make `gitlab_login_with` (née `login_with`) private
- [x] Make `mock_auth_hash` private

Changelog: https://github.com/carrierwaveuploader/carrierwave/blob/f2f8569b1013f601fe7be4b3a616359acd27240d/CHANGELOG.md#110---2017-04-30

Adds support for Rails 5.1

Changelog: https://github.com/sickill/rainbow/blob/master/Changelog.md#222-2017-04-21

Adds support for Ruby 2.4.

https://github.com/rubysherpas/paranoia/blob/core/CHANGELOG.md#230-2017-04-14

Adds support for Rails 5.1.

Adjust position and wording for related issues in merge requests

Closes #33652

See merge request !11759

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1210 disabled
autocomplete for personal snippets and project snippets. But we want
autocomplete on project snippets.

Re-enable autocomplete for milestones, tags, releases, and wiki

Closes #33598

See merge request !12110

Disable autocomplete on snippets comments

Closes #33594

See merge request !12108

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33877

Regressed in
https://gitlab.com/gitlab-org/gitlab-ce/commit/5a95d6f8dae00b31b694759c6ddbf6d83b1a7890#3a15290e7696397415523e0b664aceb3dd4010ae_0_46
where the ref no longer matches what we call `renderGFM` on.

If migrations are pending, make CurrentSettings use existing values and populate missing columns with defaults

See merge request !12253

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33594

Was supposedly fixed in MR for
https://gitlab.com/gitlab-org/gitlab-ce/issues/32086 but seeing this pop
up again

Add info about artifacts object storage in docs

See merge request !12208

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/33598

Don't display comment on unchanged line on both sides in parallel diff

Closes #33864

See merge request !12275