Arm backend: Improve error logging when running Corstone FVP

[zingo]

Instead of putting the whole FVP runtime command and log in the runtime error text only a condensed error is used, the command and the full log is outputed in the log instead.

As we now always log the command and log, you can now look and compare FVP output logs also on passed test by running run pytests with "-rP".

cc @freddan80 @per @oscarandersson8218 @digantdesai

[pytorch-bot]

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❌ 6 New Failures, 3 Unrelated Failures

As of commit 60a54b5 with merge base fedaa2d ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t ee4faa20ad47fc50de26c027cc9abe95cb26ae4a9f4be66077789756020e3404 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 3aad6c6a71f6d4db3685336b13c402919eafdf475e45a4c0283304ce144844ff /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t ee3486ab0e79a02fd52c899b8b3114b042b556de78caab54cffafe0e4b2d0cd1 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t 2cb17203505f7b05fa412df6d311eaa4e3291b28c4ec37bcf5bcb8088d919451 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t 5c652e2cde6d2de02b28074d0de133d125a3ff8b2dfad0dac633a1fa8c8db7ed /exec failed with exit code 2
• Test Metal Backend / export-voxtral-metal-artifact / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

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 / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)

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