Extend CPPCHECK scope to kernel tests

[perheld]

Remove the broad kernels/test CPPCHECK exclusion and keep the remaining suppressions scoped to that tree.

Kernel tests use fixture helpers, generated-style test data, and GTest macros that cppcheck cannot consistently resolve as direct use sites. Suppress those test-harness findings locally while keeping the rest of the CPPCHECK configuration active for kernels/test.

Change-Id: I033afb7b59b961a99d6716ff3faa068a0eed2f6a

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20216

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❌ 3 New Failures, 36 Pending, 2 Unrelated Failures

As of commit 8f4fbe5 with merge base b36bb84 ():

NEW FAILURES - The following jobs have failed:

• pull / test-arm-backend-no-driver (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t de0008f39375eadb947d6e887a761805ccc780156aee77eddab22460f88df603 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 72d06813246edd347eeea81d8bd76359484b5121bf240e08124188759460651e /exec failed with exit code 1
• trunk / test-coreml-delegate / macos-job (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128

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

• Test Vulkan Backend / test-vulkan / test-backend-linux (vulkan, models) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• Test XNNPACK Backend / test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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[Copilot]

Pull request overview

This PR narrows CPPCHECK exclusions by removing the broad kernels/test/** skip and replacing it with targeted cppcheck suppressions scoped to kernels/test, so kernel tests remain analyzed without being blocked by known cppcheck/GTest macro limitations.

Changes:

• Remove kernels/test/** from CPPCHECK’s exclude_patterns so kernel tests are included in linting.
• Add localized --suppress=...:*kernels/test/* cppcheck suppressions for common false positives in the kernel test harness.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

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Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

[perheld]

I tried to merge, got a conclict because I merged the other PR for quantized. Tried solving it in the webui (never trying that again) ending up with a whole bunch of commits that didnt make sense. Solved it locally and force pushed.