Merge branch '22981-compare-branches-diffs' into 'master'

Use full-width for both inline and side-by-side diffs in compare

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/152432



Merged-by: Payton Burdette <pburdette@gitlab.com>
Approved-by: Paul W <19602001-paintedbicycle-gitlab@users.noreply.gitlab.com>
Approved-by: Nataliia Radina <nradina@gitlab.com>
Approved-by: Payton Burdette <pburdette@gitlab.com>
Reviewed-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Reviewed-by: Nataliia Radina <nradina@gitlab.com>
Co-authored-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>