Instead of immediately throwing an error if a watch Action is invalid (email for example), we can now pass an option object to the fromUpstreamJson() method and receive back any error in the Watch.
The JSON object has now a "watchErrors" object that will be used in the UI to display an error message to the user.

fix(watch): Add models in public code to handle watch errors

fix(watcher): Add temp styling for error messages

fix(watcher): Set actionErrors to null instead of empty object when no error

test(watcher): Fix broken tests after adding watchErrors prop on the Watch

test(watcher): Add test for WatchError class

fix(watcher): Add Watch & Action state for CONFIG_ERROR

fix(watcher): move inline style to its scss file

fix(watcher): Add Error display modal to show configuration errors

fix(watcher): Add accesibility to errors display modal

fix(Watcher): Remove table col width breaking IE layout

fix(watcher): Add i18n support for errors modal title

fix(Watcher): Do not throw Action error on GET calls

test(Watcher): Check that correct action type is created from upstreamJson

fix(Watcher): Add action instances to payload before saving Watch

Angular Json editor was not sending the actions instances so no validation in Node.js
was done when creating the instances on the server.
Now it correctly create the action instances *before* the POST request to save/edit the Watch

test(Watcher): Migrate Action server test to Jest

fix(Watcher): Add warning dialog when saving a Watch with a missing 'to' field