Purge parent collections in inheritance cases

[CvekCoding]

Q	A
Branch?	4.1
Tickets	https://github.com/api-platform/core/issues/7034
License	MIT
Doc PR

In the case when we clear the cache, we haven't covered the scenario where an entity is part of a class hierarchy (such as STI). In this case, the cache for all parent collections should also be cleared.

For example, we have a Product and its subclass ChildProduct. If we already have a Products collection in the cache, when a new ChildProduct is created, only the cache for the ChildProduct collection will be purged, while the parent collection will remain unchanged.

In my opinion, this is more of a bug than a feature request.

[soyuka]

I'd love some test for this