[BE][Easy]: Change typing to DimsType in dim_reduction

[Skylion007]

Use prims_common DimsType to reduce duplication of DType

cc @H-Huang @awgu @wanchaol @fegin @fduwjj @wz337 @wconstab @d4l3k

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[albanD]

Thanks

[Skylion007]

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Reason: 11 jobs have failed, first few of them are: inductor / cuda12.6-py3.10-gcc9-sm86 / test (inductor_torchbench, 1, 2, linux.g5.4xlarge.nvidia.gpu), pull / linux-focal-py3.13-clang10 / test (default, 5, 5, lf.ephemeral.linux.4xlarge), pull / linux-focal-py3.9-clang10 / test (default, 2, 5, lf.ephemeral.linux.4xlarge), pull / linux-jammy-py3.9-gcc11 / test (default, 4, 5, lf.ephemeral.linux.2xlarge), pull / linux-jammy-py3.10-clang15-asan / test (default, 6, 6, lf.ephemeral.linux.4xlarge)

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Merge failed

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Merge failed

Reason: 11 jobs have failed, first few of them are: inductor / cuda12.6-py3.10-gcc9-sm86 / test (inductor_torchbench, 1, 2, linux.g5.4xlarge.nvidia.gpu), pull / linux-focal-py3.13-clang10 / test (default, 5, 5, lf.ephemeral.linux.4xlarge), pull / linux-focal-py3.9-clang10 / test (default, 2, 5, lf.ephemeral.linux.4xlarge), pull / linux-jammy-py3.9-gcc11 / test (default, 4, 5, lf.ephemeral.linux.2xlarge), pull / linux-jammy-py3.10-clang15-asan / test (default, 6, 6, lf.ephemeral.linux.4xlarge)

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Successfully rebased skylion007/dim-reduction-dimstype-2025-04-18 onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout skylion007/dim-reduction-dimstype-2025-04-18 && git pull --rebase)

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