viable/strict/1791826217: [BE][MPS] Remove test_mps.py tests already covered by OpInfo (#200579)

发生了什么

Removes 34 hand-written CPU-vs-MPS comparison tests (29 in TestMPS , 5 in MatmulTest , plus the now-unused MatmulTest._helper ) whose calls are all already exercised by TestConsistency OpInfo samples. Coverage was checked by recording, under a dispatch mode, every aten call each test makes on MPS (overload, input dtypes, 0-d/empty/non-contiguous inputs, which arguments are passed, out= /in-place variant) and compari…

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