Arm backend: Disable fusing of TOSA ops

[oscarandersson8218]

Disable fusing of ops that have symbolic shapes as arguments. Also disable fusing of TOSA dialect ops.

cc @digantdesai @freddan80 @per @zingo @mansnils @Sebastian-Larsson @robell

[pytorch-bot]

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❌ 1 New Failure, 2 Cancelled Jobs, 3 Unrelated Failures

As of commit 27fd39e with merge base eef7921 ():

NEW FAILURE - The following job has failed:

• pull / unittest / linux / linux-job (gh)
  examples/models/test/test_export.py::ExportTest::test_ic3_export_to_executorch

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• trunk / test-models-macos-coreml (ic3) / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-macos-cpu (llama, portable) / macos-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[zingo]

OK to to merge

[oscarandersson8218]

Failure seems unrelated.