Migrate terraform widget to V2

What does this MR do and why?

Migrates the Terraform Widget to the Widget Framework V2.

Screenshots or screen recordings

Desktop view:

terraform-widget-desktop

Mobile view:

terraform-widget-mobile

Error state:

How to set up and validate locally

1. Fork https://gitlab.com/gitlab-org/frontend/playground/gitlab-mr-widgets-demo
2. Change the README.md file to create an MR
3. Wait for the MR to be complete
4. Refresh the page to see the Terraform Widget

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #413625 (closed)