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/EntityFramework/UserRepository.cs

@@ -128,5 +128,10 @@ namespace Bit.Core.Repositories.EntityFramework
         {
             throw new NotImplementedException();
         }
+
+        public Task<IEnumerable<User>> GetManyAsync(IEnumerable<Guid> ids)
+        {
+            throw new NotImplementedException();
+        }
     }
 }