[Backend Tester] Report PTE size

[GregoryComer]

Add a field to the test report for PTE size (in Kb).

[GregoryComer]

Stack from ghstack (oldest at bottom):

• [Backend Tester] Clean up a few test issues #13258
• [Backend Tester] Add portable test flow #13250
• -> [Backend Tester] Report PTE size #13249
• [Backend Tester] Report delegation statistics #12846
• [Backend Tester] Report quantization and lowering times #12838
• [Backend Tester] Add tensor error statistic reporting #12809
• [Backend Tester] Add CSV report generation #12741
• [Backend Tester] [WIP] Add Qualcomm tester and register flow #12739

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13249

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures, 1 Unrelated Failure

As of commit b2ab3a5 with merge base 09d5255 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/test/harness/tester.py:
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t f5506bb19684109d75ba06c7ef2ff30273ed04c41b671ed159d1f3189d556929 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  backends/arm/test/models/stable_diffusion/test_vae_AutoencoderKL.py::TestAutoencoderKL::test_AutoencoderKL_tosa_MI
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 0b5342f842cc980cd9460c27ec8a7cf20af806e6e015457af8e321a9c13c37e9 /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

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

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