Pass SupportAgent into all admin actions

[jonasfj]

We should also ensure that SupportAgent isn't affected by rate-limits

[isoos]

I've investigated the code in admin actions, and it seems that the most difficult part would be to rewrite some of the consent models and audit records related to invites and their handling. They require an active User marking from where the invite originates from (storing the userId on the Consent entity), and this id is used in multiple places.