Arm backend: Enable run on vulkan runtime by default and add xfails

[mansnils]

Enables runing on vulkan runtime by default and add xfails for those tests that can not yet run.

cc @SS-JIA @manuelcandales @cbilgin @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 3 New Failures, 1 Unrelated Failure

As of commit 69dd7b7 with merge base 5ae40f1 ():

NEW FAILURES - The following jobs have failed:

• Lint / android-java-format / linux-job (gh)
  RuntimeError: Command docker exec -t 9f089de53da096633a8af16db20ff472442392318e20d38daba75719c0a292d2 /exec failed with exit code 1
• Test CUDA Builds / test-executorch-cuda-build-12.9 / linux-job (gh)
  RuntimeError: Command docker exec -t 12c53c4e8d1d36a4757a6d2674d2c82fc637beda0627670d2e006176c7e84c69 /exec failed with exit code 1
• trunk / test-arm-ootb-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 48491b37bd73dca8467ce79e97a6dbcd5db1a0b8f49540bbfdbdc817ac54b5b2 /exec failed with exit code 1

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

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

• Test CUDA Builds / check-all-cuda-builds (gh) (trunk failure)

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[digantdesai]

I wonder if we should spin vk tests in a different CI job? @zingo refactored Ethos ones perhaps he has an opinion ..

[zingo]

Yes Its a plan do it soon, @Michiel-Olieslagers is testing this first in our Arm internal CI.

[mansnils]

So essentially this is not even running in CI yet. Only in our internal CI. And yeah the plan is to do it soon for sure..

[mansnils]

Anyway regardless of this split we would still have run on vulkan runtime eq true here. The same way as run_on_fvp is true by default now. Essentially it just means before most VGF tests failed and now most are passing.

[zingo]

Arm oobt fail is fixed in another PR