Delete optional orphans when foreign key value is set to null #25957
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Fixes #25360
This is a case where an optional relationship is configured with delete orphans behavior. Since the relationship is optional it means that the FK value can be explicitly set to null. (This is not possible for required relationships, which is the usual case for delete orphans.) In this case the navigation fixer was not triggering behavior in the state manager to process deleting orphans.