Bulk Confirm (#1345)

* Add support for bulk confirm

* Add missing sproc to migration

* Change ConfirmUserAsync to internally use ConfirmUsersAsync

* Refactor to be a bit more readable

* Change BulkReinvite and BulkRemove to return a list of errors/success

* Refactor

* Fix removing owner preventing removing non owners

* Add another unit test

* Use fixtures for OrganizationUser and Policies

* Fix spelling

src/Core/Repositories/IUserRepository.cs

@@ -17,5 +17,6 @@ namespace Bit.Core.Repositories
         Task<DateTime> GetAccountRevisionDateAsync(Guid id);
         Task UpdateStorageAsync(Guid id);
         Task UpdateRenewalReminderDateAsync(Guid id, DateTime renewalReminderDate);
+        Task<IEnumerable<User>> GetManyAsync(IEnumerable<Guid> ids);
     }
 }