Merge branch 'merge-request-widget-approve-button' into 'master'

Merge request approval widget: Use small button

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142034



Merged-by: Mireya Andres <mandres@gitlab.com>
Approved-by: Mireya Andres <mandres@gitlab.com>
Approved-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Co-authored-by: Sascha Eggenberger <seggenberger@gitlab.com>