* When banning a federated user, also remove their content from our local
communities.
- This works by:
- Before a site ban, find all posts and comments to local communities
- Send a federated community ban action for each local comm.
- This also removes their content in the apub receive code.
- Adding back in federated community ban api tests.
- Adding in two more api tests for site bans.
- Fixes#4118
* Add local community ban, and nonlocal person check.
* Ignoring errors.
* Move local check into function.
* Addressing PR comments 2
