Bulk account confirmation actions
Closes #2085
See merge request pleroma/pleroma!2975
## Unreleased
+ ### Added
+ - Mix tasks for controlling user account confirmation status in bulk (`mix pleroma.user confirm_all` and `mix pleroma.user unconfirm_all`)
+ - Mix task for sending confirmation emails to all unconfirmed users (`mix pleroma.email send_confirmation_mails`)
+
### Changed
+- Search: Users are now findable by their urls.
- Renamed `:await_up_timeout` in `:connections_pool` namespace to `:connect_timeout`, old name is deprecated.
- Renamed `:timeout` in `pools` namespace to `:recv_timeout`, old name is deprecated.
- The `discoverable` field in the `User` struct will now add a NOINDEX metatag to profile pages when false.