Merge branch '438360-use-subscription-helper-member-roles' into 'master'

Use SubscriptionHelper for SaaS checks when creating member roles

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143503



Merged-by: Andy Soiron <asoiron@gitlab.com>
Approved-by: Jarka Košanová <jarka@gitlab.com>
Approved-by: Bala Kumar <sbalakumar@gitlab.com>
Approved-by: Andy Soiron <asoiron@gitlab.com>
Approved-by: Drew Blessing <drew@gitlab.com>
Reviewed-by: Jarka Košanová <jarka@gitlab.com>
Co-authored-by: Hinam Mehra <hmehra@gitlab.com>