Fix broken links and other minor improvements

See merge request gitlab-org/gitlab-ce!22858

Feature backported to CE in 11.5, not 10.7

Closes #53648

See merge request gitlab-org/gitlab-ce!22892

Fix Markdown so renderer parses links correctly, fixing 404s

See merge request gitlab-org/gitlab-ce!22895

Discussions redesign

Closes #29294

See merge request gitlab-org/gitlab-ce!22333

backport changes from gitlab-ee!7903

See merge request gitlab-org/gitlab-ce!22767

Fix for the filter spec failure

Closes gitlab-org/quality/nightly#34 and gitlab-org/quality/nightly#30

See merge request gitlab-org/gitlab-ce!22862

Also corrects capitalisation of Git.

Adds documentation for restricted project service account in deployment jobs

Closes #51717

See merge request gitlab-org/gitlab-ce!22810

Document that we do not support importing bare repositories from hashed storage in certain cases

Closes #41423

See merge request gitlab-org/gitlab-ce!22783

Add e2e test of push over SSH using Git protocol v2

See merge request gitlab-org/gitlab-ce!22548

Emphasis the importance of auth registry

See merge request gitlab-org/gitlab-ce!22843

StuckImportJobsWorker query performance optimization

See merge request gitlab-org/gitlab-ce!22879

Adds a btn-icon class

See merge request gitlab-org/gitlab-ce!22870

Align sign in button

Closes #53673

See merge request gitlab-org/gitlab-ce!22888

Improves the performance of fetching the enqueued
projects for StuckImportJobsWorker, preventing a
statement timeout.

Prevent attr_encrypted models from being overriden

Closes gitlab-ee#8234

See merge request gitlab-org/gitlab-ce!22764

Paginate Bitbucket Server importer projects

See merge request gitlab-org/gitlab-ce!22825

Fix failing spec in spec/controllers/admin/hooks_controller_spec.rb

attr_encrypted expects models to have their attribute methods defined,
or it will override them with standard Ruby accessors. Migration specs
that rolled back the state of the database after columns were migrated
to encrypted values were interfering with these definitions. To ensure
that the SystemHook specs pass, we need to call
`SystemHook.define_attribute_methods` to ensure that attr_encrypted sees
the right methods that reflect the latest state of the database.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/8234

Warn when MR titles are too long.

See merge request gitlab-org/gitlab-ce!22845

Usage ping - Differentiate Jira Server and Cloud

Closes #51043

See merge request gitlab-org/gitlab-ce!22791

Fix e2e create merge request test

Closes gitlab-org/quality/nightly#32

See merge request gitlab-org/gitlab-ce!22877

To prevent delays in loading the page and reduce memory usage, limit the
number of projects shown at 25 per page.

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/50021

Allow to add patches to merge requests created via email

Closes #40830

See merge request gitlab-org/gitlab-ce!22723

Fix syntax error in initializers/fill_shards

See merge request gitlab-org/gitlab-ce!22871

CE backport - Chart showing issues created per month

See merge request gitlab-org/gitlab-ce!22793

Resolve "Issue board card design"

Closes #47008

See merge request gitlab-org/gitlab-ce!21229