Skip test-samsung-models-linux on fork PRs

[GregoryComer]

Summary

Similar to #15401, skip test-samsung-models-linux on forked PRs as it requires secrets and thus fails. This should reduce false-negatives / noise on contributor PRs.

Example failure (from https://github.com/pytorch/executorch/actions/runs/18856230366/job/53804732612):

Failed to extract download URL
{"success":false,"data":null,"msg":"API key is required","page":0,"total":0}
exit 1

Test Plan

Verified that test-samsung-models-linux is skipped on this PR.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15402

• 📄 Preview Python docs built from this PR

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

✅ You can merge normally! (2 Unrelated Failures)

As of commit fe417f6 with merge base 57f0dfd ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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