[Task] Change RedactionSynchronisationProtection to check on ban events rather than on ban policies.

[Gnuxie]

This is a simplification of #10, and allows us to develop something now without waiting for the timeline cache.

Acceptance Criteria

• Any ban of a user from a room by either the bot or a moderator invokes the check against config.automaticallyRedactForReasons to redact the messages.

Issues

• redactions should.be checked at the end of every sync Draupnir#76
• Draupnir doesn't redact with automaticallyRedactForReasons when using the ban propagation protection Draupnir#156
• RedactionSynchronisationProtection: Add a hook for member bans and redact events then, not just after policy changes Draupnir#382

Dependencies

None

Total Pain

40

[Gnuxie]

We also need to check for matching policies when a user parts, in the event of deactivation or something.