* mark all notifications associated with a security task as deleted when the task is completed
* fix spelling
* formatting
* refactor "Active" to "NonDeleted"
* refactor "Active" to "NonDeleted" for stored procedure
* only send notifications per user for each notification
* move notification status updates into the DB layer to save on multiple queries and insertions from the C#
* Only return UserIds from db layer
* omit userId from `MarkTaskAsCompletedCommand` query.
The userId from the notification will be used
* update UserIds
* consistency in comments regarding `taskId` and `UserId`
