Revert "Merge pull request #55 from pixiv/revert-54-exception_notification_sidekiq"
Revert "Merge pull request #55 from pixiv/revert-54-exception_notification_sidekiq"

This reverts commit 29c871a3422a97532519c27fb9a318aa82ec884a, reversing
changes made to 5324291e32e1fc26a082fd63fb0ade90f417e1a7.

pixiv/mastodon,pixiv/mastodon,pixiv/mastodon,pixiv/mastodon