[Backend Tester] Skip tests with undelegated conv3d ops

[GregoryComer]

We are missing a portable kernel implementation for Conv3d, so any tests that contain one will fail. Since conv1d, 2d, and 3d all share the same op, we need some logic to handle this constraint and skip the test. This fixes a small number of (incorrect) test failures on the backend suite when decomposed conv3d patterns are partially delegated.

[GregoryComer]

Stack from ghstack (oldest at bottom):

• [Backend Tester] Increase QNN linux runner size #14200
• [Backend Tester] Add ARM TOSA flow #14190
• -> [Backend Tester] Skip tests with undelegated conv3d ops #14185

[pytorch-bot]

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❌ 1 New Failure, 13 Pending

As of commit 8581f01 with merge base e7fecdf ():

NEW FAILURE - The following job has failed:

• Build Presets / apple (profiling) / build (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128

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