Setup Cypress for E2E testing

[vikrampm1]

Is your enhancement related to a problem? Please describe.

See overall concept in the OSBP guide and example setups on Simple Podcasting, Restricted Site Access, and 10up/ElasticPress#2446.

Describe the solution you'd like

add base GitHub Action
add .wp-env.json
add base docker files
update package.json / package lock files
add cypress tests
remove any WP Acceptance components

Designs

n/a

Describe alternatives you've considered

n/a

Additional context

https://github.com/10up/cypress-wp-setup/ && https://github.com/10up/cypress-wp-utils will be helpful in getting this spun up and some initial test commands to leverage.