Add option to disable logging completely

Also combined patch attached for #3372256 + #3372260 since these have a merge conflict in the update hook (since both require a new update hoo)

@scott_euser I am thinking that I might, while working on the other issue, split this into two configuration options so logging for each type of notification (content updates vs content review) can be enabled/disabled separately. Right now, the option makes it seem like this option is just for logging with content update notifications.

Makes sense to me given there are two config pages, will update the MR with this shortly.

Updated the MR splitting into two configurations. Thanks!

Thanks! Changed to fixed since its committed.

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