Avoid filtering out relationships where entities support filtering

[OmarHawk]

Fix #26356

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[OmarHawk]

This is for discussion whether it makes sense to limit this change to Angular only or to some other condition or to pass again the relationship kind of unfiltered to each kind of client.

My Opinion: Why would we want to limit what the client code does with the relationships, i.e. why should it be filtered out so early? So I think, my approach is alright.