[Backend Tester] Migrate to pytest

[pytorchbot]

Refactor the backend test suites to use pytest. This includes the following changes:

• Define pytest markers for each backend and test flow (recipe). This allows for easy filter, such as by running pytest some/path/... -m backend_xnnpack.
• Use a parameterized pytest fixture to handle test generation / expansion for each test flow.
• Switch to using the pytest-json-report plugin for reporting. Update the markdown generation script to take json.
• Shim the existing unittest-based logic for op tests.
  • I've updated add.py to show what they should look like long-term. I've also just updated the model tests, since there aren't as many. I'll update the remaining op tests later in this stack, though this is purely to clean up the code. The shimming logic makes them work properly with pytest in this PR.
• Update the backend test CI to use pytest.

This also has the benefit of making the jobs much faster by leveraging parallel execution. I've also added a repro command to the markdown summary.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14661

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 8 New Failures, 4 Pending

As of commit 04478d3 with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e3319c27cccb7fcb35339b8ab86efdb9a09b1905fa36faf12f316383e38a19dd /exec failed with exit code 1
• pull / test-llama-runner-linux (fp32, xnnpack+custom+qe, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu-22.04-... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• pull / unittest-nxp-neutron / linux-job (gh)
  test_split_group_convolution__2d_1_group_3
• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  backends/arm/test/models/stable_diffusion/test_CLIPTextModelWithProjection.py::TestCLIPTextModelWithProjection::test_CLIPTextModelWithProjection_tosa_INT
• trunk / test-llama-runner-linux (bf16, custom, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'
• trunk / test-llama-runner-linux (fp32, xnnpack+custom, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh)
  AttributeError: '_OpNamespace' 'llama' object has no attribute 'sdpa_with_kv_cache'

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