Use delegated vars for the delegated host name

In _process_pending_results (strategy/__init__.py), we were using the delegate_to
field directly from the original task, which was not being templated correctly.
As an alternate to #23599, this patch instead pulls the host name out of the delegated
vars passed back in the task result dictionary to avoid having to re-template things.

Fixes #23599
Fixes #20508

lib/ansible/plugins/strategy/__init__.py

@@ -241,11 +241,13 @@ class StrategyBase:
         return host_list
 
     def get_delegated_hosts(self, result, task):
-
-        host_name = task.delegate_to
+        host_name = result.get('_ansible_delegated_vars', {}).get('ansible_host', None)
+        if host_name is not None:
             actual_host = self._inventory.get_host(host_name)
             if actual_host is None:
                 actual_host = Host(name=host_name)
+        else:
+            actual_host = Host(name=task.delegate_to)
 
         return [actual_host]