Skip PR governance issue-link enforcement for fork-origin PRs

[Copilot]

The PR Governance action was failing on fork-origin pull requests because the workflow could not post/update governance comments with the integration token, yet still hard-failed on missing linked issues. This change makes the governance issue-link check non-blocking for fork PRs.

• What changed

  • Added an early fork-PR guard in .github/scripts/pr-governance-issue-check.js.
  • Detects when pull_request.head.repo.full_name differs from ${owner}/${repo}.
  • Marks the check as skipped (skipped=true) and exits before issue-link enforcement.

• Behavior impact

  • Same-repo PRs: existing linked-issue requirement remains unchanged.
  • Fork PRs: governance issue-link check is skipped instead of failing due to token permission constraints.

• Code snippet

  const isForkPr =
    pr.head?.repo?.full_name &&
    pr.head.repo.full_name !== `${context.repo.owner}/${context.repo.repo}`;
  
  if (isForkPr) {
    core.setOutput('skipped', 'true');
    return;
  }

[microsoft-github-policy-service]

Hi @@copilot. Thank you for your interest in helping to improve the Azure Developer CLI experience and for your contribution. We've noticed that there hasn't been recent engagement on this pull request. If this is still an active work stream, please let us know by pushing some changes or leaving a comment. Otherwise, we'll close this out in 7 days.