* Enable new Rails/* cops and use autocorrect on them
* Fixed Rails/PluckInWhere leftovers
* Fix Rails/DefaultScope
* Enable and fix Rails/PluckId
* Fix manual mistake with forcing autocorrection on Rails/PluckId
* Apply PR feedback to remove Rails/PluckId inline disables
* Apply PR feedback to get rid of Rails/PluckInWhere inline
* Prepare factories and associations for Users::DeleteActivity specs
* Altered user associations, delete the needed associations in Users::DeleteActivity
* Moved and refined user deletion spec
* Removed useless commented user associations
* Refactored BackupData factory
* Refactored ProfilePin factory
* Refactored Reaction factory
* Fixed specs: Keep default _type in factories or specify it in tests
* Ok, notes shouldn't be deleted on user deletion
* Fixed creating reactable for specs
* Specify commentable/commentable_type explicitly when creating data for tests
* Fixed typo in the comments spec
* Removed unnneeded space
* Added aggregate_failures for testing user associations deletion
* Keep feedback_messages while deleting user activities
* Notifications unique indexes that take null values into account
* Specify import options for reaction notifications according to the indexes
* Fix specs: notifications have either user_id or organization_id
* Create notifications indexes concurrently
