count on Extra Lazy many-to-many requiring ID where LAZY does not

Id of joined column doesn't work without the join column of the owner being an ID field.

    $id             = $this->uow->getEntityIdentifier($collection->getOwner());

Line 119 of ManytoManyPersister.
which only runs when EXTRA LAZY. Otherwise, count and LAZY functions work fine.

Allow for non ID fields to be used in many-to-many relationships and allow for EXTRA_LAZY functionality.

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