Arm backend: add VGF runtime accuracy comparisons

[robell]

Change-Id: I3807992095a75caa687081ed7a25a0c2b664d524
Signed-off-by: Rob Elliott Robert.Elliott@arm.com

Add pte execution using runtime python bindings, and additional stats to ensure export and quant accuracy is maintained through the whole pipeline as further optimisations are explored.

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

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❌ 3 New Failures, 1 Cancelled Job

As of commit 61ba920 with merge base 1f7c6d0 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 1ff8d907794ab69419882ca2b973f491dee4d9173b7309c21b5e8a177e0950ff /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 9b2c05e23b50b06bc64b5f9ddd208752ddacac18e80feb75f34f7780300be7a1 /exec failed with exit code 1
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t d74ee4e701df4a6e989c291d0fc70971dd58be1cbb4bb6aec6b3e7d72984f7e9 /exec failed with exit code 1

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

• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.

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