Codex: run update-link-index on default branch instead of hardcoded main

[reakaleek]

What

• Run the update-link-index job when pushing to the repository default branch instead of only main
• Repos with master (or any other default branch) can now register in the codex link index

Why

• Enables onboarding repos whose default branch is master to Elastic Internal Docs
• The previous check github.ref == 'refs/heads/main' caused update-link-index to never run for those repos, so they never appeared in the codex

Notes

• Uses github.event.repository.default_branch to support any default branch name

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