Extract inline GitHub Action scripts to separate files

[Copilot]

Addresses review feedback to move inline JavaScript from trigger-ci.yml into separate script files for better maintainability and testability.

Changes

• Created .github/scripts/ directory with four modular scripts:

  • check-permissions.js - Permission validation
  • post-unauthorized-comment.js - Error handling for unauthorized users
  • get-pr-details.js - PR metadata extraction
  • create-ci-pr.js - CI branch and draft PR creation

• Updated workflow to use require() instead of inline code:

# Before
script: |
  try {
    const permission = await github.rest.repos.getCollaboratorPermissionLevel({
      owner: context.repo.owner,
      repo: context.repo.repo,
      username: context.actor
    });
    // ... 15+ lines of inline code
  } catch (error) {
    // ...
  }

# After
script: |
  const script = require('./.github/scripts/check-permissions.js');
  return await script({ github, context });

Follows the pattern established in vercel/vercel workflows.

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Latest commit: 7aa6c98

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