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

test/Core.Test/AutoFixture/PolicyFixtures.cs

@@ -0,0 +1,39 @@
+using System.Reflection;
+using AutoFixture;
+using AutoFixture.Xunit2;
+using Bit.Core.Enums;
+
+namespace Bit.Core.Test.AutoFixture.OrganizationUserFixtures
+{
+    internal class Policy : ICustomization
+    {
+        public PolicyType Type { get; set; }
+
+        public Policy(PolicyType type)
+        {
+            Type = type;
+        }
+        
+        public void Customize(IFixture fixture)
+        {
+            fixture.Customize<Core.Models.Table.Policy>(composer => composer
+                .With(o => o.Type, Type)
+                .With(o => o.Enabled, true));
+        }
+    }
+
+    public class PolicyAttribute : CustomizeAttribute
+    {
+        private readonly PolicyType _type;
+
+        public PolicyAttribute(PolicyType type)
+        {
+            _type = type;
+        }
+
+        public override ICustomization GetCustomization(ParameterInfo parameter)
+        {
+            return new Policy(_type);
+        }
+    }
+}