Add Playwright Tests for Admin Tools feature introduced in sprint 6.

[JCantu248]

🗣 Description

This pull request introduces UI test cases for the Admin Tools feature which was introduced in Sprint 6. UI features related to scan data are tested, but buttons that would trigger a scan are not clicked, just checked for visibility. Closes #181

💭 Motivation and context

This change is necessary to perform UI testing as part of the deployment workflow.

🧪 Testing

Test cases were added and run from the Playwright VS Code plugin. When the test were working correctly, the entire suite was run once again and ensured all existing tests still pass.

✅ 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.

✅ Pre-merge checklist

• Revert dependencies to default branches.
• Finalize version.

✅ Post-merge checklist

• Create a release.