Skip Samsung jobs that require secrests on forked PRs

[GregoryComer]

Summary

Don't run Samsung jobs which require secrets on forked PRs. They fail. It looks like they used to be disabled on forks, but this line ended up getting left commented out after the jobs were disabled and re-enabled. This PR restores it to the original state.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18064

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⏳ No Failures, 29 Pending

As of commit 718c1d3 with merge base 7b5c60d ():
💚 Looks good so far! There are no failures yet. 💚

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