Added license to Wasm example scripts

[Conarnar]

Summary

Added the license header to the bash scripts added in #12303.

Test plan

N/A

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12604

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❌ 1 New Failure

As of commit 4496a43 with merge base 4456407 ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 4242671fce2a19d8c27a12c5d888f4ba6a2d7963427cf3e5f8f2959c8d4f8a4f /exec failed with exit code 1

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