Add command to clone repository into AWS Playwright Container

[JCantu248]

🗣 Description

Modify the Terraform and Regression Test Actions to clone the XFD repository into the AWS Playwright Container.

💭 Motivation and context

Github Actions can now run the AWS Playwright Container, but it does not have any test cases. This change should bring the repository into the container so it can access the test cases.

🧪 Testing

It is being tested in this PR.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

[nickviola]

LGTM