[easy] cmake-format extension/training/CMakeLists.txt

[swolchok]

It wasn't format-clean.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• Convert pthreadpool to ExternalProject #12468
• Build XNNPACK as an ExternalProject #12425
• Format CMakeLists.txt files about to be changed in EXPORT PR #12463
• -> [easy] cmake-format extension/training/CMakeLists.txt #12451
• [easy] cmake-format CMakeLists.txt #12450

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12451

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure

As of commit 76db1f1 with merge base ee9e6d9 ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 5d9cb49205d7a5471c499d91a4a4a9c47a35cdfc46eb1ffb1203e4f134832370 /exec failed with exit code 1

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