[Backend Tester] Skip inf and nan operator tests

[GregoryComer]

Skip tests that validate inf and nan edge cases. In hindsight, it's not reasonable to validate these on backends, with varying quantization and precision. I've marked them as skip to allow for manually running as they might have some conceptual value to backend authors.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• [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/13990

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❌ 2 New Failures

As of commit 5d3597e with merge base 41c299f ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 06c0810953e88d7ecf85ec3b26aba2e765c960302401758bbe35837928aff632 /exec failed with exit code 1

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