feat: mark metro as dependency

Author: V3RON

apps/playground/project.json

@@ -3,7 +3,8 @@
         "start": {
             "executor": "nx:run-commands",
             "dependsOn": [
-                "react-native-harness:build"
+                "react-native-harness:build",
+                "@react-native-harness/metro:build"
             ],
             "options": {
                 "command": "node ../../packages/cli/dist/index.js",