test: add curl versions tracker workflow

[SortaCookie]

This is explicitly a test. Introduce a new GitHub Actions workflow to run curl verbosely against the cloud SDK versions json, count success/failure rates, and sleep between consecutive runs. The default number of runs is set to 50.

Bug: 533070065

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[github-actions]

🤖 Gemini Suggested Commit Message

---

ci: Add curl versions tracker workflow

Introduce a new GitHub Actions workflow to monitor the reliability of
network requests against the cloud SDK versions endpoint. This tool
performs a configurable number of verbose curl operations with sleep
intervals to help diagnose intermittent connectivity or rate
limiting encountered in the CI environment.

Issue: 864

---

💡 Pro Tips for a Better Commit Message:

1. Influence the Result: Want to change the output? You can write custom prompts or instructions directly in the Pull Request description. The model uses that text to generate the message.
2. Re-run the Generator: Post a comment with: /generate-commit-message