Cadence: Warning if reference kernels not implemented for registered ops

[DrJessop]

Summary: I ran into a problem where some new ops were checked into ops_registrations.py without an associated ref implementation. For now, I am warning for all of these situations, but once I can run without warnings, will error out instead.

Differential Revision: D84650725

[pytorch-bot]

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❌ 2 New Failures

As of commit bf10bf4 with merge base 8fa1e38 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3db9a6796ed112c264e16a5a2cb770237d3c3348d34f642fccc11435670a0ac8 /exec failed with exit code 1
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t 9f6562796f63b52b9fd26a85d2b37ad341f5f6be3025236f56d752cdd69d881d /exec failed with exit code 2

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[meta-codesync]

@DrJessop has exported this pull request. If you are a Meta employee, you can view the originating Diff in D84650725.

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