Merge branch 'sdejonge-remove-badge-dark-mode-overrides' into 'master'

Remove sticky header badge dark mode overrides

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167560



Merged-by: Martin Wortschack <mwortschack@gitlab.com>
Approved-by: Thomas Randolph <trandolph@gitlab.com>
Approved-by: Martin Wortschack <mwortschack@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>