marked multithreaded trace benchmarks test to be skipped during CI as its flaky with github action machines

.github/workflows/unit-tests.yaml

@@ -32,7 +32,7 @@ jobs:
         run: uvx poetry install --with dev
 
       - name: Unit tests
-        run: uvx poetry run pytest tests/ --cov --cov-report=xml --benchmark-skip
+        run: uvx poetry run pytest tests/ --cov --cov-report=xml --benchmark-skip -m "not ci_skip"
 
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v5

tests/test_trace_benchmarks.py

@@ -177,11 +177,8 @@ def test_code_to_optimize_bubble_sort_codeflash_trace_sorter():
         output_file.unlink(missing_ok=True)
         shutil.rmtree(replay_tests_dir)
 
-# Skip the test if the machine has only 1 thread/CPU
-@pytest.mark.skipif(
-    multiprocessing.cpu_count() <= 1,
-    reason="This test requires more than 1 CPU thread"
-)
+# Skip the test in CI as the machine may not be multithreaded
+@pytest.mark.ci_skip
 def test_trace_multithreaded_benchmark() -> None:
     project_root = Path(__file__).parent.parent / "code_to_optimize"
     benchmarks_root = project_root / "tests" / "pytest" / "benchmarks_multithread"