[Backend Tester] Add flow-specific skipped tests, skip argmin/max on Core ML due to native crashes, float16/64 on Vulkan

[GregoryComer]

Argmin and argmax are crashing on Core ML. Native crashes are hard to recover from. In the medium term, I'd like to look at using pytest-xdist, which, by nature of process isolation, can recover. But for now, I'm adding a way to skip tests on specific backend flows to allow running the remaining tests. I've also skipped Vulkan float16 and float64 tests, as they crash when using swiftshader (used in the CI for software execution of the Vulkan compute shaders). This should be re-visited in the future.

There is also a little technical debt in the code duplication between operator and model tests. This will also be cleaned up shortly.

[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]

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

As of commit 4a50cab with merge base 6d8583d ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/test/suite/operators/__init__.py:
• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / test-eval_llama-wikitext-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 703766ae6b3c0ecfa948f1fd701036792f4377216da7e3e63978193b8f9d8ede /exec failed with exit code 1

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

• pull / test-binary-size-linux-gcc / linux-job (gh)
• pull / test-llava-runner-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh)
  ##[error]The operation was canceled.

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

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

• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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