[MPS/BE] Remove decorator that skipped test on macOS 12.

[dcci]

macOS 12 is not really supported anymore.

cc @kulinseth @albanD @malfet @DenisVieriu97 @jhavukainen @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov

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[malfet]

Thank you for the cleanup

[malfet]

@pytorchbot merge -f "This sounds fine"

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