[MPS] Fix internal assertion in torch.linalg.solve for singular matrices

[inventshah]

Fixes #163962 by special casing MPS in the negative status code branch in _linalg_check_errors.

Checks if info is MPSMatrixDecompositionStatus.singular (which has a raw value of -2). I didn't find an official Apple source with this raw value (besides printing the enum value), so I'm not sure if we can (or should) depend on it? Is there a way to directly get the Objective-C enum value in C++?

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