Install and implement Jest-Axe for accessibility testing in unit tests

[doubleedesign]

Summary

What is the nature of this pull request?

• New feature
• Enhancement to an existing feature
• Bug fix
• Configuration update
• Dependency update

Description of change

This PR implements Jest-Axe for testing our components against accessibility guidelines.

Planner card link

Implement Jest-Axe for accessibility testing in unit tests

Readiness

• The application runs successfully with my change.
• I have included code comments where appropriate.
• Where I have copied and pasted code from other sources, I have included a comment with a link to the original source.
• I have read and followed the principles and guidelines about submitting code.
• I have added unit tests for new components and/or functionality.
• All existing and new unit tests pass (including updating tests for any necessary breaking changes).