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/Models/Data/OrganizationUserPublicKey.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace Bit.Core.Models.Data
+{
+    public class OrganizationUserPublicKey
+    {
+        public Guid Id { get; set; }
+        public string PublicKey { get; set; }
+    }
+}