Report connecting apps from the TLS socket

Summary:
This was missing. Only apps going through the certificate exchange process were marked as 'apps trying to connect'.

This changes fixes it.

Notes:

In my tests it is not always visible as the app can establish the connection very quickly. So you may be wondering what the point is:
- Consistency across our connection process.
- It will become useful of there's a failure coming from an app that already has the client certificate.

Reviewed By: Katalune

Differential Revision: D51984388

fbshipit-source-id: 44796ed5666f4570adbfcf455063c5a56936778f

desktop/flipper-server/src/app-connectivity/ServerController.tsx

@@ -266,6 +266,13 @@ export class ServerController
         ),
       );
     }
+
+    const client: UninitializedClient = {
+      os: clientQuery.os,
+      deviceName: clientQuery.device,
+      appName: appNameWithUpdateHint(clientQuery),
+    };
+    this.emit('start-client-setup', client);
   }
 
   /**