[EC-598] fix: messenger crashing

The messenger is listening to all DOM communcation, most of which is formatted differently. We were not handling these cases properly which resulted in attempts to access undefined fields.

apps/browser/src/content/webauthn/messaging/messenger.ts

@@ -40,7 +40,9 @@ export class Messenger {
 
     const promise = firstValueFrom(
       this.channel.messages$.pipe(
-        filter((m) => m.metadata.requestId === requestId && m.type !== request.type)
+        filter(
+          (m) => m != undefined && m.metadata?.requestId === requestId && m.type !== request.type
+        )
       )
     );