[Backend Tester] Refactor workflows into one workflow per backend

[GregoryComer]

Split the backend test workflows out of the nightly job. This should make it easier to read the summary job as it won't cram all of the jobs onto one page.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• [Backend Tester] Increase linux runner size #14200
• [Backend Tester] Add ARM TOSA flow #14190
• [Backend Tester] Skip tests with undelegated conv3d ops #14185
• -> [Backend Tester] Refactor workflows into one workflow per backend #14137
• [Backend Tester] Add flow-specific skipped tests, skip argmin/max on Core ML due to native crashes, float16/64 on Vulkan #13992
• [Backend Tester] Add error message field to CSV report #13991
• [Backend Tester] Skip inf and nan operator tests #13990
• [Backend Tester] Skip in-place activation tests due to lack of support in ET #13989

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14137

• 📄 Preview Python docs built from this PR

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❌ 7 New Failures, 2 Cancelled Jobs, 3 Unrelated Failures

As of commit e72553e with merge base ed0ab94 ():

NEW FAILURES - The following jobs have failed:

• nightly / link-check / lint-xrefs / linux-job (gh)
• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.2xlarge, executorch-ubuntu-22.04... / linux-job (gh)
  RuntimeError: Command docker exec -t ebe0b681d1b30d173ea81dc8383f569def26f0f44a4155541872ea6a2c86cc24 /exec failed with exit code 1
• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t ad5e1866fe7c1bee9de0ea2d091248e0fc92b28e03813a25d5e0ee8ba766f704 /exec failed with exit code 1
• pull / test-models-linux (mv2, portable, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 34aab58d64cafffcc6f3281fb60a00785ce6138bacaa5bb918ed4c56653e77f6 /exec failed with exit code 1
• pull / test-models-linux (resnet18, portable, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t cbf11b8d65556ef61654d2b1419b0e8eac47b9b442de3ccee93c9b507697d373 /exec failed with exit code 1
• pull / test-models-linux (w2l, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Command docker exec -t cf647d0b599f3993f8bcc4901d63a15c26c7dc0c4fb49c5e804a04c46d68bf3e /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t b410d15c8a8ee8311d0349075e803da5b303de371cb3c107f24062a44c53593c /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• periodic / gather-models (gh)
• Test CoreML Backend / test-coreml / test-backend-macos (coreml_static_int8, operators) / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-llama-lora-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

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

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[mergennachin]

Looks good

[digantdesai]

Manually trigger - https://github.com/pytorch/executorch/actions/workflows/nightly.yml - once more before merging?