fix(@angular-devkit/schematics): use error logger method when there is a workflow error

Author: alan-agius4

packages/angular_devkit/schematics_cli/bin/schematics.ts

@@ -195,7 +195,7 @@ export async function main({
         error = true;
 
         const desc = event.description == 'alreadyExist' ? 'already exists' : 'does not exist';
-        logger.warn(`ERROR! ${event.path} ${desc}.`);
+        logger.error(`ERROR! ${event.path} ${desc}.`);
         break;
       case 'update':
         loggingQueue.push(tags.oneLine`