Arm backend: Support TFA-decomposable INT ops in no-quant mixed profile

[YufengShi-dudu]

In the INT-only profile, some integer ops are expected to be decomposed by the transform-for-annotation pipeline before partitioning, so they are intentionally absent from TOSA_PRO_INT_SupportList.

The no-quant mixed INT+FP profile does not run that pipeline, so the original ops can reach the partitioner and be rejected because they are absent from TOSA_PRO_INT_SupportList. However, these ops can still be supported by decomposition passes in the backend pipeline.

Add a mixed INT support list that extends TOSA_PRO_INT_SupportList with backend-decomposable integer ops for mixed-profile partitioning. Include slice_scatter in that extension and remove the corresponding VGF no-quant xfails

Change-Id: I0ccc5484dc8c8311cefb069df9e2a4878bd98c9a

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 2 New Failures, 1 Cancelled Job, 2 Pending, 1 Unrelated Failure

As of commit 3b57343 with merge base 3f0e901 ():

NEW FAILURES - The following jobs have failed:

• Test WebGPU Backend / test-webgpu / test-backend-linux (webgpu, models) / linux-job (gh)
  RuntimeError: Command docker exec -t 3fbf4c55d3cf30e40726c2756a8f898455c8d13ab23bdbcb8c3f0d9409d36c51 /exec failed with exit code 1
• Test WebGPU Backend / test-webgpu / test-backend-linux (webgpu, operators) / linux-job (gh)
  RuntimeError: Command docker exec -t c684f04e9a280544c6e46142e992f9840bebbfa1f1eafb99a5c7faaf91bb72cb /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• Build Presets / linux (linux, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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