Add failing test for failing to update child-parent relation when the child has been prefetched in QB

[simPod]

I have discovered this test case that reproduces bug when there's a child relation indexed

/**
 * @OneToMany(targetEntity=GH7212Child::class, mappedBy="parent", indexBy="id")
 * @var GH7212Child[]|Collection
 */
protected $children;

and then join in qb ->leftJoin('p.children', 'c')

then the relationship is not getting updated. $child->setParent(null) produces no change.

[github-actions]

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[github-actions]

This pull request was closed due to inactivity.

[simPod]

@greg0ire can you reopen please?