Log more admin actions

While we’re on the subject…

Blocks by the system user don’t have any context:

Delete post has no context (self-deleted in these cases):

Delete user reveals email address:
https://meta.discourse.org/t/privacy-email-of-deleted-users-displayed-in-staff-logs/39324
Also occurs with revoke email.

3 separate logs for same event (spam topic/user):

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