Merge branch 'ph/fixReviewerEditTooltip' into 'master'

Updates reviewer button tooltip when reviewer_assign_drawer is disabled

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/149521



Merged-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Co-authored-by: Phil Hughes <me@iamphill.com>