Channels last: teach the data-movement passes both permute dialects

[rascani]

Collect the aten and channels_last permute targets into one shared set and
thread it through the transforms that match, fuse, or assert on a permute.
Before this the passes matched aten.permute_copy by identity, so a
channels_last.permute_copy pair inserted by the layout replacement was
invisible to every canceller in the tree and survived untouched.

No pass gains a new capability; each simply stops ignoring half of the
operators it was written to handle. Inert for callers that never produce the
dialect, which today is all of them.

91 pre-existing permute and channels-last tests, plus a case pinning that an
inverse layout-copy pair around an elementwise operator now cancels.

Authored with Codex.

[rascani]

Stack from ghstack (oldest at bottom):

• Cortex-M: add an opt-in NHWC method I/O contract #22029
• Cortex-M: keep NHWC channel broadcasts quantized #21968
• Cortex-M: add opt-in explicit layout lowering #21967
• Cortex-M: make quantized add and multiply layout-agnostic #21966
• Cortex-M: add a contiguous-layout pad operator #22028
• Cortex-M: add explicit-NHWC runtime operators #21965
• Cortex-M: share layout-aware CMSIS-NN kernels #21964
• Channels last: add the common layout pipeline #21963
• Channels last: absorb boundary layout copies into the method contract #22034
• Channels last: optimize structural layout regions #21962
• -> Channels last: teach the data-movement passes both permute dialects #22003

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