Unique indexes are not respecting tenants

[JohnCampionJr]

Indexes are not doing anything special with tenant ID's.

So uniques were being filtered across the collection instead of by tenant.

As I thought about it, it makes sense to include tenant ID on indexes specifically created by attributes on IHaveTenantId entities.

Thought about adding an index automatically on the tenant ID, but that's early done with an [Index] attribute on that property.

PR coming with fix.