Replace Node `joinPaths` with custom impl

See merge request gitlab-org/gitlab!21078

**Why?**
The current implementation of `joinPaths` comes from the
Node core modules `path` and has a number of caveats:

- Does not support non-string values
- Does not handle joining absolute URL's

https://nodejs.org/api/path.html#path_path_join_paths

**Note:**
The new impl of `joinPaths` does not do the same special
normalization which the Node version did. This should be
safe because I'm pretty sure we only use this method to
join paths with `/` that potentially start and end with
a `/`.

Resolve "Admin Area's *Runners* page is confusing with use of *State* and *Type*"

Closes #29165

See merge request gitlab-org/gitlab!21591

Turn job_log_json feature flag on by default

See merge request gitlab-org/gitlab!21543

Add most affected projects to group security dashboard

See merge request gitlab-org/gitlab!20892

This commit adds a new sidebar item to the group security dashboard.

It consists of an accordion, showing projects grouped by the
most severe vulnerability within the project.

Add Snippet GraphQL API mutations

See merge request gitlab-org/gitlab!20956

Quarantine flaky performance bar test

See merge request gitlab-org/gitlab!21669

Unquarantine tests in security_reports_spec.rb

Closes #38199

See merge request gitlab-org/gitlab!21583

Further refactoring for test stability, and remove unused data selectors
and functions

docs: Add missing Content-Type header for ES requests

See merge request gitlab-org/gitlab!21488

Adjust deprecation note for only/except

See merge request gitlab-org/gitlab!21021

Rename `approved` to `allowed`

See merge request gitlab-org/gitlab!21282

Revert "Merge branch 'ab/pagination-batch-counts' into 'master'"

See merge request gitlab-org/gitlab!21698

Accept sentry_issue_identifier on issue creation

See merge request gitlab-org/gitlab!21081

Add table to store the sentry event and issue ids
that are related to a gitlab issue

API::Helpers::Pagination.paginate_and_retrieve!
is not called at all atm.

Enhance danger bot documentation

See merge request gitlab-org/gitlab!21443

- this note would have been helpful when setting up danger
  on versions app

This reverts commit 7a5656b7, reversing
changes made to f663c871.

Left changes to lib/api/helpers/pagination.rb and
spec/lib/api/helpers/pagination_spec.rb as they have later modifications
made to them but nothing will now use `#paginate_and_retrieve!` for now.

Resolve "Follow-up from "Edit of runtimes content""

Closes #38227

See merge request gitlab-org/gitlab!21293

It could be either an A record or a CNAME

Simplify test to make it more reliable

See merge request gitlab-org/gitlab!21686

Cleaning up merge request PO

See merge request gitlab-org/gitlab!21625

Add running tests to FE tips doc

See merge request gitlab-org/gitlab!20934

Web IDE: Fix the console error that happens when discarding a newly added/uploaded file.

See merge request gitlab-org/gitlab!21537

[ci skip]

[ci skip]

[ci skip]

[ci skip]

Remove jasmine focused test

See merge request gitlab-org/gitlab!21693

Merge branch '27239-display-a-better-message-when-starting-a-discussion-on-a-deleted-comment' into 'master'

Resolve "Display a better message when starting a discussion on a deleted comment"

See merge request gitlab-org/gitlab!20031

Shows "Your comment could not be submitted because the original comment
has been deleted" when replying to a deleted comment.

Implement Tillerless install and uninstall

See merge request gitlab-org/gitlab!20894

Quarantine file lock spec due to bug in code

See merge request gitlab-org/gitlab!21674

Add more relations to Group Export

See merge request gitlab-org/gitlab!21504