fix(cli + tests): Bump metro to 0.66 + fix test manual script (#31597)

Summary:
Bumped react-native-community/cli to v6 to update metro to 0.66 to fix fast-refresh issues
Also updated the manual test e2e script for easier testing. (using npm install would create a package-lock.json and conflict with yarn.lock)

## Changelog

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[GENERAL] [UPDATE] - updated react-native-community/cli to v6 (hence updating metro to 0.66)

Pull Request resolved: #31597

Test Plan: I've tested fast-refresh works with / without hermes

Reviewed By: TheSavior

Differential Revision: D28852660

Pulled By: yungsters

fbshipit-source-id: af338e4dd1d52c62949d71f42773963d89bca9db

package.json

@@ -90,9 +90,9 @@
   },
   "dependencies": {
     "@jest/create-cache-key-function": "^27.0.1",
-    "@react-native-community/cli": "^5.0.1-alpha.0",
-    "@react-native-community/cli-platform-android": "^5.0.1-alpha.0",
-    "@react-native-community/cli-platform-ios": "^5.0.1-alpha.0",
+    "@react-native-community/cli": "^6.0.0-rc.0",
+    "@react-native-community/cli-platform-android": "^6.0.0-rc.0",
+    "@react-native-community/cli-platform-ios": "^6.0.0-rc.0",
     "@react-native/assets": "1.0.0",
     "@react-native/normalize-color": "1.0.0",
     "@react-native/polyfills": "1.0.0",

scripts/test-manual-e2e.sh

@@ -40,7 +40,7 @@ rm -rf android
 
 success "Generated artifacts for Maven"
 
-npm install
+yarn
 
 success "Killing any running packagers"
 lsof -i :8081 | grep LISTEN