Add an env:destroy command

[dkotter]

Description of the Change

We have commands to start and stop an environment but it's also nice to have a command to destroy an environment once you're done with it. This PR adds that by default to the package.json file.

In addition, there were some issues with the newest version of wp-env which is installed when this project is used (and during our E2E tests). I didn't intend to fix those things as well but in order to get E2E tests to pass, a few minor changes were required there.

Alternate Designs

None

Possible Drawbacks

None

Verification Process

Check out this branch and set up a new project to ensure the command gets added

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Changelog Entry

Added - New command, env:destroy that is used to destroy an environment
Fixed - Addressed a few issues with the latest version of wp-env

Credits

Props @dkotter