Fix include loading for handler runs

When using the free (or host_pinned) strategy if your playbook includes
a tasks, roles and handlers, an error can occur when handlers are run
and there are included files to process. In the free.py strategy[0], when
included files are run there is an additional check to see if the
included file is a role and to process that differently than if it's an
included file.

[0] https://github.com/ansible/ansible/blob/c8704573396e7480b3e1b33b2ddda2b6325d0d80/lib/ansible/plugins/strategy/free.py#L244-L254

Resolves #69457

lib/ansible/plugins/strategy/__init__.py

@@ -1005,7 +1005,17 @@ def _do_handler_run(self, handler, handler_name, iterator, play_context, notifie
         if len(included_files) > 0:
             for included_file in included_files:
                 try:
-                    new_blocks = self._load_included_file(included_file, iterator=iterator, is_handler=True)
+                    if included_file._is_role:
+                        ir = self._copy_included_file(included_file)
+                        # get_block_list returns (blocks, handlers)
+                        # and in this isntance we only care about the handler
+                        # blocks
+                        (_, new_blocks) = ir.get_block_list(
+                                play=iterator._play,
+                                variable_manager=self._variable_manager,
+                                loader=self.loader)
+                    else:
+                        new_blocks = self._load_included_file(included_file, iterator=iterator, is_handler=True)
                     # for every task in each block brought in by the include, add the list
                     # of hosts which included the file to the notified_handlers dict
                     for block in new_blocks: