2.6: Backport _cond_not_supported_warn() (#41126) (#48175)

* 2.6: Backport _cond_not_supported_warn() (#41126)

(Partially cherry picked from commit 5f7ffd39dc)

* Fix changelog

changelogs/fragments/46275-fix-_cond_not_supported_warn.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+    - Fix for StrategyModule object has no attribute _cond_not_supported_warn (https://github.com/ansible/ansible/issues/46275)

lib/ansible/plugins/strategy/__init__.py

@@ -943,6 +943,9 @@ class StrategyBase:
 
         return ret
 
+    def _cond_not_supported_warn(self, task_name):
+        display.warning("%s task does not support when conditional" % task_name)
+
     def _execute_meta(self, task, play_context, iterator, target_host):
 
         # meta tasks store their args in the _raw_params field of args,