* Validate JS script upon saving
* Relay error on invalid code
* Handle execution errors
* Render error messaging that execution error occurred
* Relay error message
* Handle reverting changes
* On revert, notify users they need to refresh pages to revert JS changes
* Expose link to refresh page while keeping visual editor open
GB-198 Custom JS - Add UX to Visual Editor to create/edit JS script
* Validate JS script upon saving * Relay error on invalid code * Handle execution errors * Render error messaging that execution error occurred * Relay error message * Handle reverting changes * On revert, notify users they need to refresh pages to revert JS changes * Expose link to refresh page while keeping visual editor open