Add an integration test for replacing a foreign key constraint #6825
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Constraints cannot be modified neither in the DBAL Schema API, nor in databases – they can be dropped and added. However,
ComparatorandTableDiffrepresent non-equal foreign key constraints with the same name as "modified".I want to deprecate the notion of "modified foreign keys", but before that I need to make sure that handling one constraint being replaced by another is covered by an integration test.