Update run.sh to use arm-none-eabi-size

[AIWintermuteAI]

Summary

As discussed in #7104, it's preferred to use arm-none-eabi-size to determine the binary size, as built-in size will not be able to correctly read ARM binary on all platforms.

Fixes #7104.

Test plan

Ran run.sh on Mac M1.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7125

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✅ You can merge normally! (1 Unrelated Failure)

As of commit ed51e90 with merge base e83ab0e ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest / macos / macos-job (gh) (detected as infra flaky with no log or failing log classifier)

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[zingo]

Thanks for fixing this. And welcome as a contributor to the project .