Merge branch...

Merge branch 'lw/508335-adapt-user-add-on-assignments-deletion-locations-to-deletion-with-callbacks' into 'master' 

Switch from delete_all to destroy_all for user add-on assignments

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/177421



Merged-by: Omar Qunsul <oqunsul@gitlab.com>
Approved-by: Jon Jenkins <jjenkins@gitlab.com>
Approved-by: Jarka Košanová <jarka@gitlab.com>
Approved-by: John Mason <9717668-johnmason@users.noreply.gitlab.com>
Approved-by: Omar Qunsul <oqunsul@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: Lukas Wanko <lwanko@gitlab.com>