Test revert of "Add CortexM Tests to CI (#15690)"

[GregoryComer]

Unit tests are failing since this PR. It looks unrelated, but I'm testing a revert here to see if it resolves.

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15765

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:x: 2 New Failures, 8 Unrelated Failures

As of commit 44138712575da76ba917e1e6d815cf7c96b28f08 with merge base 34828bfe91739ce1fe6c1269cb75fc88f33d6ee3 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner-mypy / linux-job (gh) >>> Lint for backends/arm/test/misc/test_call_operator_submodule.py:
• trunk / test-arm-cortex-m-size-test (zephyr-preset) / linux-job (gh) RuntimeError: Command docker exec -t 3852c50d7bf85f71e86e4674c16a56124c31dbf73be4ac0b1c33c183c7f73668 /exec failed with exit code 1

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-static-llama-qnn-linux (stories_110m) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest / macos / macos-job (gh) (trunk failure) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest-editable / linux / linux-job (gh) (trunk failure) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest-editable / macos / macos-job (gh) (trunk failure) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• trunk / unittest-release / linux / linux-job (gh) (trunk failure) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• trunk / unittest-release / macos / macos-job (gh) (trunk failure) backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe

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