Fix 500 errors with legacy appearance logos

Closes gitlab-ee#9357

See merge request gitlab-org/gitlab-ce!24615

[API] Omit `X-Total` and `X-Total-Pages` headers when items count is more than 10,000

Closes #42194 and #52674

See merge request gitlab-org/gitlab-ce!23931

Prior to GitLab 9.0, attachments were not tracked the `uploads` table,
so it was possible that the appearance logos were just stored in the
database as a string and mounted via CarrierWave.

https://gitlab.com/gitlab-org/gitlab-ce/issues/29240 implemented in
GitLab 10.3 was supposed to cover populating the `uploads` table for all
attachments, including all the logos from appearances. However, it's
possible that didn't work for logos or the `uploads` entry was orphaned.

GitLab instances that had a customized logo with no associated `uploads`
entry would see Error 500s. The only way to fix this is to delete the
`logo` column from the `appearances` table and re-upload the attachment.

This change makes things more robust by falling back to the original
behavior if the upload is not available.

This is a CE backport of
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9277.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/9357

documentation: Add `git clone` to list of basic git commands

Closes #56514

See merge request gitlab-org/gitlab-ce!24474

Improve Review Apps documentation

See merge request gitlab-org/gitlab-ce!24597

[QA] Use public_email instead of email since it's available

Closes gitlab-org/quality/staging#27

See merge request gitlab-org/gitlab-ce!24533

Fix broken docs link

Closes #56754

See merge request gitlab-org/gitlab-ce!24611

Clarify `ssh` and `https` cloning, as well as where to find the `url`s
to those repositories.

Signed-off-by: Rémy Coutable <remy@rymai.me>

Added `btn_class` to the dropdown for custom notifications

See merge request gitlab-org/gitlab-ce!24557

Externalize strings from `/app/views/sent_notifications`

See merge request gitlab-org/gitlab-ce!24576

Update Helm to 2.12.2 to address Helm client vulnerability

Closes #56417

See merge request gitlab-org/gitlab-ce!24418

Signed-off-by: Rémy Coutable <remy@rymai.me>

Merge branch '56731-wait_for_job_to_be_done-gitlab-assets-compile-fails-in-the-review-build-cng-job' into 'master'

Resolve "`wait_for_job_to_be_done "gitlab:assets:compile"` fails in the `review-build-cng` job"

Closes #56731

See merge request gitlab-org/gitlab-ce!24598

Resolve "Changing wording to "Delete" when referring to removing a branch"

Closes #25569

See merge request gitlab-org/gitlab-ce!23966

Add troubleshooting section to Slack Notification Service

See merge request gitlab-org/gitlab-ce!24339

Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix bug that caused Suggestion Markdown toolbar button to insert snippet with leading +/-/<space>

See merge request gitlab-org/gitlab-ce!24568

Add Avatar in the settings sidebar

Closes #56582

See merge request gitlab-org/gitlab-ce!24515

All review jobs should share the same only & except

Closes #56707

See merge request gitlab-org/gitlab-ce!24579

Fix serverless.yml template indentation

See merge request gitlab-org/gitlab-ce!24548

Avoid installing Bundler 2.0 or higher on source-based install

Closes #55979

See merge request gitlab-org/gitlab-ce!24502

Rename entrypoint for clusters update/edit page

Closes #56715

See merge request gitlab-org/gitlab-ce!24583

Upgrade Prettier to v1.16

See merge request gitlab-org/gitlab-ce!24581

Upgrade babel to v7.3

See merge request gitlab-org/gitlab-ce!24573

Add domain field into Clusters::Cluster

See merge request gitlab-org/gitlab-ce!24368

For the stake of standardizing, I've switched the ssl debugging to use
the Rails console rather than a Ruby script file.

Offer more explanation regarding the ssl-test script and how it's used.

This is to match `git branch -D <branchname>`