[MPS] Fix and unblock TestConsistency for median (#94489)
- fix num_output_dims calculation
- fix median_out_mps key
- cast tensor sent to sortWithTensor and argSortWithTensor
- note down same issue for unique
- unblock median from blocklist
- adding test_median_int16 test
Fixes #ISSUE_NUMBER
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94489
Approved by: https://github.com/razarmehr
