Add supaguard ai to synthetic monitoring tools list

[maddhruv]

Pull Request Template

What are you trying to address

Adding https://supaguard.app/ to the synthetic monitoring tests tools

• Write a detailed description of all changes - and if appropriate, why they are needed

Checklist

READY TO PR? Use the check-list below to ensure your branch is ready for PR.

• Changes follow the repo structure and land in the appropriate folder and section
• No confidential information
• No duplicated content
• Labeled appropriately
• This PR was reviewed by at least one subject matter expert
• No lint check errors related to your changes

Note: You may see link check errors on pages you have not touched. This is normal, and due to either broken links or sites that reject link checker bots. The reviewer will help you get to a green state on these.