Resolve "table_exists? not compatible with Rails 5.1"

Closes #54478

See merge request gitlab-org/gitlab-ce!30832

Remove duplicate content about auto-devops customization

See merge request gitlab-org/gitlab-ce!30929

Update guidance for EE doc submissions

See merge request gitlab-org/gitlab-ce!31042

Note GitLab University may be out of date in parts

See merge request gitlab-org/gitlab-ce!31034

Update documentation for current state

Closes #64710

See merge request gitlab-org/gitlab-ce!30873

Stop printing dots while retrieving pod in review-apps.sh

See merge request gitlab-org/gitlab-ce!31062

Improve steps for setting commit email

Closes #54881

See merge request gitlab-org/gitlab-ce!30833

Refine topics for Phase 2 of SSoT audit

Closes #64682

See merge request gitlab-org/gitlab-ce!30831

Includes admin_area and application_security
topics.

Restructure project cluster topic

See merge request gitlab-org/gitlab-ce!31081

Also fixes links to section headings that
have changed.

Add a section of examples to code review docs

Closes #64194

See merge request gitlab-org/gitlab-ce!30825

We have a fairly good guide to Code Reviews, but can be improved
by adding a few examples of what a good code review looks like
at GitLab, specifically ones where there is a bit of back and
forth, "nit-picking," etc. This would:

+ help set expectations of newly hired engineers around what our
process looks like when it is functioning what level of scrutiny
their code will be under

+ how we have technical conversations

+ show by example how after you're done crafting a solution, there
can still be extra work done either tidying up code and/or managing
the communication and conversations about your proposed MR

Fix typo in param name

See merge request gitlab-org/gitlab-ce!31100

Clarify difference between project name and project path for API usage

See merge request gitlab-org/gitlab-ce!31019

Support Docker OCI images

Closes gitlab-ee#12877 and #58685

See merge request gitlab-org/gitlab-ce!31127

Vue-i18n: Autofix additional i18n lints for vue files

See merge request gitlab-org/gitlab-ce!31125

Autofixes additional linting errors
found in vue files.

Refactor usage data counters specs

See merge request gitlab-org/gitlab-ce!31013

[CE] Create serializer for Jira API JSON payload

See merge request gitlab-org/gitlab-ce!31139

Docker Distribution v2.7.0 shipped with OCI support, but our container
registry client was not updated to handle the manifest format in the
HTTP `Accept` header.  As a result, API calls to retrieve a manifest
would return with an error, "OCI manifest found, but accept header does
not support OCI manifests". This would result in blank fields in the
container registry page and prevent tags from being deleted.

To fix this, we just need to add
`application/vnd.oci.image.manifest.v1+json` to the `Accept` header and
configure Faraday to parse the response as JSON. The response structure
is the same as the standard Docker Distribution V2 manifest.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58685

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/12877

Revert "Workaround for Rails 5, where LIMIT..."

See merge request gitlab-org/gitlab-ce!30780

Return an ETag header for the archive endpoint

See merge request gitlab-org/gitlab-ce!30581

Partial CE-EE parity for specs

See merge request gitlab-org/gitlab-ce!31119

Make RelativePositioning reusable

See merge request gitlab-org/gitlab-ce!30993

CE port of "Fix spam in issue creation by making project private"

See merge request gitlab-org/gitlab-ce!30997

Changes all calls to data_source_exists? to table_exists?
since that is the intent of these calls

Docs: Improve SCIM documentation

See merge request gitlab-org/gitlab-ce!31091

Add documentation on how to add dependencies to yarn

See merge request gitlab-org/gitlab-ce!31066

Fix rendering in Newline section

See merge request gitlab-org/gitlab-ce!30992

Enable Rubocop Performance/ReverseEach

See merge request gitlab-org/gitlab-ce!31120

Documentation - Removed the unnecessary loop

See merge request gitlab-org/gitlab-ce!31003