Codemod codecache.py from Optional to union none

[oulgen]

Stack from ghstack (oldest at bottom):

• Codemod inductor/fx_passes from Optional to union none #165606
• Codemod inductor/runtime from Optional to union none #165605
• -> Codemod codecache.py from Optional to union none #165604

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov @coconutruben

[pytorch-bot]

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✅ You can merge normally! (4 Unrelated Failures)

As of commit d440cf1 with merge base 5e480b8 ():

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

• pull / linux-jammy-py3.13-clang12 / test (dynamo_wrapped, 3, 3, lf.linux.2xlarge) (gh) (similar failure)
  test/profiler/test_profiler.py::TestExperimentalUtils::test_profiler_optimizer_single_tensor_pattern
• trunk / linux-jammy-py3-clang12-executorch / test (executorch, 1, 1, lf.linux.2xlarge) (gh) (similar failure)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_w2l_model

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

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

• pull / linux-jammy-py3.13-clang12 / test (crossref, 1, 2, lf.linux.2xlarge) (gh) (trunk failure)
  test/test_multiprocessing_spawn.py::ParallelForkServerPerfTest::test_forkserver_perf
• pull / linux-jammy-py3.13-clang12 / test (dynamo_wrapped, 1, 3, lf.linux.2xlarge) (gh) (trunk failure)
  test/test_multiprocessing_spawn.py::ParallelForkServerPerfTest::test_forkserver_perf

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[aorenste]

I was considering doing this too - but was concerned about people worrying about unnecessary code churn

[pytorchmergebot]

Starting merge as part of PR stack under #165606