FilterEagerLoadingsExtension changes query even when eager loading is disabled

When eager loading is disabled for a specific operation, our own implementation of FilterEagerLoadingsExtension is still changing the query, which is unexpected and could potentially leads to less optimal queries.

Our implementation:
https://github.com/ecamp/ecamp3/blob/devel/api/src/Doctrine/Orm/Extension/FilterEagerLoadingsExtension.php#L36

Upstream implementation:
https://github.com/api-platform/core/blob/main/src/Doctrine/Orm/Extension/FilterEagerLoadingExtension.php#L51

Verify if this was done on purpose and check if we can copy the few lines from upstream implementation without breaking anything else.

The new subresource operation introduced in https://github.com/ecamp/ecamp3/pull/9849 would be a good test case.