chore: adding cypress-axe for e2e testing a11y

[thaddmt]

Description of changes

• Added cypress-axe automated testing of a11y to our various connected components
• Adds a simple test which tests against wcag 2.0 AAA standards
• Screenshots of how errors look below

In the console

In Cypress

Issue #, if available

Description of how you validated changes

Checklist

• [ ] Have read the Pull Request Guidelines
• [ ] PR description included
• [ ] Relevant documentation is changed or added (and PR referenced)
• [ ] yarn test passes and tests are updated/added
• [ ] No side effects or sideEffects field updated

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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Latest commit: 756c43dd5dc2e5e49000384b1f0c7e606e0942d6

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