feat: add Infracost to DevOps & Infrastructure section

[AndresRJ18]

Added Infracost as an AI-powered cloud cost estimation tool.

🚀 Summary

Adds Infracost to the DevOps & Infrastructure section, an AI-powered cloud cost estimation tool for Terraform and Pulumi.

✅ Checklist

• I have read the contribution guidelines
• The tool is AI-related and useful for developers
• I have added a short, clear description of the tool
• The link is not a duplicate of an existing one
• The title of the link is properly capitalized
• The link follows the Awesome List format (- [Tool Name](link) – description)
• My change does not include unrelated files or changes

📌 Why is this tool awesome?

Infracost integrates directly into pull requests and CI/CD pipelines to show cloud cost estimates before deploying infrastructure changes with Terraform or Pulumi, helping teams make cost-aware decisions early in development.

🔗 Link

https://www.infracost.io/

📝 Additional context