Don't flash the performance monitor there's no metro connection (facebook#54019)

Summary:
Pull Request resolved: facebook#54019

Currently the performance monitor flickers on boot if there's no metro connection. This change checks first if we have a packager before enabling the monitor.

No metro connection:
{F1982423105}

Metro connection:
{F1982423112}

Changelog: [Internal]

Reviewed By: shwanton

Differential Revision: D83701372

fbshipit-source-id: d099880d3ab509942a937a6bde11ebdde13450cd

Author: sbuggay

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevSupportManagerBase.kt

@@ -567,8 +567,10 @@ public abstract class DevSupportManagerBase(
       perfMonitorOverlayManager?.let { manager ->
         reactInstanceDevHelper.inspectorTarget?.addPerfMonitorListener(manager)
       }
-      perfMonitorOverlayManager?.enable()
-      perfMonitorOverlayManager?.startBackgroundTrace()
+      if (isPackagerConnected) {
+        perfMonitorOverlayManager?.enable()
+        perfMonitorOverlayManager?.startBackgroundTrace()
+      }
       perfMonitorInitialized = true
     }