Added a failing test for #2088.

This test ensures the serializer does not confuse a new record
returned in response to a delete with the original record when both
records are of the same type.


I have confirmed that if we pass the `recordId` to `extractDeleteRecord` (similar to what pr https://github.com/emberjs/data/pull/1779 is proposing) this test will pass. That parameter was previously being passed to all the `extact*` functions but it appears to have been accidentally dropped when `aliasMethod` was removed to improve debugging in https://github.com/emberjs/data/commit/dd964d2b7fe87ef7368336bd401c40834950f736.