Merge branch 'pipeline-editor-file-tree' into 'master'

Fix pipeline editor file tree spacing

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/131676



Merged-by: Vitaly Slobodin <vslobodin@gitlab.com>
Approved-by: Julia Miocene <jmiocene@gitlab.com>
Approved-by: Vitaly Slobodin <vslobodin@gitlab.com>
Co-authored-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>