Add Cypress tests plus GitHub workflow back to v6

[carloskelly13]

Description

• Adds back Cypress tests that use the demos embedded in the new doc's website to test a standard and wrap-around carousel
• Adds Cypress tests for navigational touch gestures with different speeds and distance values
• Fixes a bug that makes sure Nuka is built upon pnpm install of the doc's website to ensure dependencies are found

Type of Change

• [x] New feature (non-breaking change which adds functionality)
• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

This has been tested locally by running the Cypress tests and in the CI workflow via the passing GitHub action.