Move OPTIMIZE_SIZE to default preset

[jathu]

Summary

TSIA

Test plan

$ cmake --preset macos-arm64 && cmake --build cmake-out --parallel
$ test/build_size_test.sh

cc @larryliu0820

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10802

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❌ 3 New Failures, 6 Pending

As of commit 70387e5 with merge base 4a738bd ():

NEW FAILURES - The following jobs have failed:

• pull / test-llava-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 07acf86b3785c77e62d14f46d1a461ec1accbb0cfb74f763e3bf1c95b6e6798f /exec failed with exit code 139
• trunk / test-llama-runner-mac (fp32, xnnpack+custom+quantize_kv) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos (efficient_sam, portable) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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