[PM-10319] - Revoke Non Complaint Users for 2FA and Single Org Policy Enablement (#5037)

- Revoking users when enabling single org and 2fa policies.
- Updated emails sent when users are revoked via 2FA or Single Organization policy enablement

Co-authored-by: Matt Bishop <mbishop@bitwarden.com>
Co-authored-by: Rui Tomé <108268980+r-tome@users.noreply.github.com>

src/Core/AdminConsole/Models/Data/SystemUser.cs

@@ -0,0 +1,16 @@
+using Bit.Core.Enums;
+
+namespace Bit.Core.AdminConsole.Models.Data;
+
+public class SystemUser : IActingUser
+{
+    public SystemUser(EventSystemUser systemUser)
+    {
+        SystemUserType = systemUser;
+    }
+
+    public Guid? UserId => throw new Exception($"{nameof(SystemUserType)} does not have a {nameof(UserId)}.");
+
+    public bool IsOrganizationOwnerOrProvider => false;
+    public EventSystemUser? SystemUserType { get; }
+}