Fix module_utils_common.respawn test. (#78248)

The respawn failure can be returned on either stdout or stderr.

test/integration/targets/module_utils_common.respawn/tasks/main.yml

@@ -21,4 +21,4 @@
     # ensure that the respawned interpreter is not the same as the default
     - default_python.interpreter_path != respawned_python.interpreter_path
     # multiple nested respawns should fail
-    - multi_respawn is failed and multi_respawn.module_stderr is search('has already been respawned')
+    - multi_respawn is failed and (multi_respawn.module_stdout + multi_respawn.module_stderr) is search('has already been respawned')