10.2.0 Deprecation Clenaup

I can confirm that MR #69 fixed the issue described in the Problem/Motivation section.
user_roles() and user_role_names() are deprecated in Drupal 10,
so I think we need to merge these changes

Note for the 8.x-1.x version:
This ends up importing 📌 Inform admin that role does not have permission to setup own tfa Fixed in order to make the code match 2.x. Originally was not backported since it involved adding the EntityTypeManager to the constructor which I was avoiding for a 'feature', however since its now necessary for Deprecation handling it doesn't hurt to bring the rest of it. No trigger_error on the deprecation as the class is final in 2.x, there is no need to inform of a future deprecation need.

Automatically closed - issue fixed for 2 weeks with no activity.