process replay: only enter prefix when interacting with process (#35884)

* save 1-2s for full route

* cu

* stock

* Revert "stock"

This reverts commit 7cfb550817.

* clean up

selfdrive/test/process_replay/process_replay.py

@@ -274,13 +274,13 @@ class ProcessContainer:
     assert self.rc and self.pm and self.sockets and self.process.proc
 
     output_msgs = []
-    with self.prefix, Timeout(self.cfg.timeout, error_msg=f"timed out testing process {repr(self.cfg.proc_name)}"):
     end_of_cycle = True
     if self.cfg.should_recv_callback is not None:
       end_of_cycle = self.cfg.should_recv_callback(msg, self.cfg, self.cnt)
 
     self.msg_queue.append(msg)
     if end_of_cycle:
+      with self.prefix, Timeout(self.cfg.timeout, error_msg=f"timed out testing process {repr(self.cfg.proc_name)}"):
         # call recv to let sub-sockets reconnect, after we know the process is ready
         if self.cnt == 0:
           for s in self.sockets: