New e2e test suite (#555)

* add @cypress/schematic as a dev dependency

* replace protractor with cypress

* remove the boilerplate test

* add the cypress-wait-until helper library

* add cypress-wait-until to all tests

* add signet to stg proxy config

* add proxy config for production

* add environment configs to angular.json

* update e2e target to use the production proxy

* update serve and start scripts to use the new environment config

* add the concurrently lib to the dev dependencies

* fix missing import

* ignore videos and screenshots saved by the e2e suite

* add fixtures for the tests

* update cypress npm scripts to use concurrently

* add some e2e tests

frontend/cypress/plugins/index.js

@@ -0,0 +1 @@
+module.exports = (on, config) => {}