Merge branch '441776-add-throttling' into 'master'

Add throttling to bulk assignments

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144745



Merged-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Approved-by: Cameron McFarland <cmcfarland@gitlab.com>
Approved-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Reviewed-by: Bishwa Hang Rai <bhrai@gitlab.com>
Reviewed-by: Dzmitry Meshcharakou <12459192-dmeshcharakou@users.noreply.gitlab.com>
Co-authored-by: Bishwa Hang Rai <bhrai@gitlab.com>