When NoTracking is used, empty BSON collections result in null CLR collections.

Previous closed bug which fixed behaviour for tracked queries: https://jira.mongodb.org/browse/EF-105

To reproduce, change the following tests to use NoTracking:

db.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;

1. OwnedEntity_non_nullable_collection_is_empty_when_empty
2. OwnedEntity_nullable_collection_is_empty_when_empty

I believe the following code should also be executed when using NoTracking (entry == null) to fix the issue:

https://github.com/mongodb/mongo-efcore-provider/blob/main/src/MongoDB.EntityFrameworkCore/Query/Visitors/MongoProjectionBindingRemovingExpressionVisitor.cs#L606-L610