Move get_agent_obs_text function to browser utils and add return_all option (#9019)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/security/invariant/parser.py

@@ -50,6 +50,7 @@ def parse_action(trace: list[TraceElement], action: Action) -> list[TraceElement
         event_dict = event_to_dict(action)
         args = event_dict.get('args', {})
         thought = args.pop('thought', None)
+
         function = Function(name=action.action, arguments=args)
         if thought is not None:
             inv_trace.append(Message(role='assistant', content=thought))