[Backend Tester] Add ARM TOSA flow

[GregoryComer]

Wire up the Arm tester with the backend test suites. This is an initial implementation, which is missing a few things. Most notably, output accuracy stats aren't available. I intend to take this as a follow-up.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• [Backend Tester] Increase QNN linux runner size #14200
• -> [Backend Tester] Add ARM TOSA flow #14190
• [Backend Tester] Skip tests with undelegated conv3d ops #14185

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14190

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• Test ARM Backend (gh)

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[digantdesai]

cc @zingo , @per as FYI

[zingo]

This will be nice to see and play with!
It might be good to look into Ethos-U/VGF FLOWs down the line and this takes us quite long way to fullfill that, thanks!