Update minimum ruby version to 2.5.

See merge request gitlab-org/gitlab-ce!25496

EE Allow Gitaly N+1 in MR CreationsController

Closes #9917

See merge request gitlab-org/gitlab-ee!9671

Refactor params for NotesActions

Closes #54924

See merge request gitlab-org/gitlab-ce!25278

Removes unneeded params from permitted list

This also fixes commenting on commits with a hash starting with a large
number

Docs serverless updates

See merge request gitlab-org/gitlab-ce!25497

Merge branch '58062-tracing-url-template-render-using-string-format-does-not-play-well-with-urls' into 'master'

Switch back to using regexps in tracing_url_template

Closes #58062

See merge request gitlab-org/gitlab-ce!25491

Fixes a master failure due to a reduction in
the accepted Gitaly query count.

Merge branch 'docs-serverless-updates' of gitlab.com:gitlab-org/gitlab-ce into docs-serverless-updates

Fix header links in PG and Redis HA/Scaling docs

See merge request gitlab-org/gitlab-ee!9668

Docs: add details about restricted SSH keys

Closes #50489

See merge request gitlab-org/gitlab-ce!25478

Add an index page to admin area section

Closes #55234

See merge request gitlab-org/gitlab-ce!25375

Add an index page to admin area section

See merge request gitlab-org/gitlab-ee!9601

Changes to HA docs to inc different architecture types

See merge request gitlab-org/gitlab-ee!9174

Resolve "/admin/runners page fails with an SQL Statement Timeout"

Closes #53325

See merge request gitlab-org/gitlab-ce!25220

Lower the allowed Gitaly call count to 30

See merge request gitlab-org/gitlab-ce!25467

Prior to this change, 35 Gitaly RPCs were allowed. But recently there's
been a renewed interest in performance. By lowering the number of
calls new N + 1's will pop up.

Later commits will add blocks to ignore the raised errors, followed by
an issue for each to be fixed.

Split Severity and Confidence values for vulnerability occurrences

Closes #9397

See merge request gitlab-org/gitlab-ee!9495

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/9397