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MDEV-11602 InnoDB leaks foreign key metadata on DDL operations
Essentially revert MDEV-6759, which addressed a double free of memory by removing the freeing altogether, introducing the memory leaks. No double free was observed when running the test suite -DWITH_ASAN. Replace some mem_heap_free(foreign->heap) with dict_foreign_free(foreign) so that the calls can be located and instrumented more easily when needed.
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