ci: test tenki runners

[asutosh23]

PR: Migrate CI Workflows to Tenki Runners

About Tenki

Tenki provides high-performance, flexible GitHub Runners that replace self-hosted or legacy CI solutions with a faster, more secure, and cost-efficient alternative.

With Tenki, teams benefit from:

• ⚡ Faster pipelines: ~30% average improvement in job execution time through optimized infrastructure
• 💰 Significant savings: up to ~90% cheaper compared to traditional CI runner solutions
• 🔒 Stronger security: runners run on ephemeral VMs, ensuring clean, isolated environments for every job
• 📈 Scalable options: a broad catalog of runner types with built-in autoscaling to match workload demand

---

Modifications in This PR

• Updated GitHub Actions workflows to use Tenki runner labels

---

✅ This PR completes the initial migration to Tenki runners.