Always update `last_execute_log_path_` on batch requests.

Needed because a non-batch command execution in between batch requests can modify it.

PiperOrigin-RevId: 900159854

centipede/centipede_callbacks.cc

diff --git a/centipede/centipede_callbacks.cc b/centipede/centipede_callbacks.cc
index af247e1..43ad89a 100644
--- a/centipede/centipede_callbacks.cc
+++ b/centipede/centipede_callbacks.cc
@@ -465,6 +465,8 @@
       if (!execute_ret) {
         return true;
       }
+    } else {
+      last_execute_log_path_ = cmd.stdout_file();
     }
     if (command_context.persistent_mode_server != nullptr &&
         command_context.persistent_mode_server->RunBatch(deadline, exit_code)) {