This PR removes logic where we handle both `@nx/` and `@nrwl/` scope.
The latter scope has stopped being published in v20, and are no longer
relevant.
- Cleans up e2e
- Removes references to `@nrwl/` scope in our generators and executors
- Removes `@nrwl/` from `nx/package.json` `packageGroup`
- Cleans up documentation quality script
