Arm backend: Enable pytest VKML op unit testing in ciflow/trunk

[mansnils]

Enable VKML op unit test for Arm backend.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 8 Cancelled Jobs

As of commit ffcb292 with merge base 53b4cb9 ():

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

• trunk / test-arm-backend (test_models_ethos-u55) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend (test_models_ethos-u85) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend (test_models_tosa) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh)
  ##[error]The operation was canceled.
• trunk / test-arm-backend (test_pytest_ops_vkml) / linux-job (gh)
• trunk / test-arm-backend (test_run_ethosu_fvp) / linux-job (gh)
• trunk / test-arm-backend (test_smaller_stories_llama) / linux-job (gh)

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[zingo]

Ouch, all jobs timedout installing/building the deps :(
Until we get precompiled deps this might need to be pre-build in the docker.
Maybe the Vulkan backend already have a solution to copy/clone?