[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 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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❌ 1 New Failure, 1 Cancelled Job, 3 Unrelated Failures

As of commit 7b79d5a with merge base ed0ab94 ():

NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/passes/test_channels_last_tagged_reshape.py::TestChannelsLastTaggedReshapePass::test_conv_linear_dim_order_swap_partitioner

CANCELLED JOB - The following job was cancelled. Please retry:

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

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-linux-android / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-phi-3-mini-runner-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following job failed but were 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.

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