Avoid reporting runtime errors with unknown file types

When loading inline skip-lists we should just ignore files that
we do not know how to process. This fixes bug where encountering
reno release notes may have cause failure to process noqa on them.

src/ansiblelint/skip_utils.py

@@ -108,10 +108,11 @@ def _append_skipped_rules(pyyaml_data: Sequence[Any], lintable: Lintable) -> Seq
             # assume it is a playbook, check needs to be added higher in the
             # call stack, and can remove this except
             return pyyaml_data
-    elif lintable.kind in ['yaml', 'requirements', 'vars']:
+    elif lintable.kind in ['yaml', 'requirements', 'vars', 'meta', 'reno']:
         return pyyaml_data
     else:
-        raise RuntimeError('Unexpected file type: {}'.format(lintable.kind))
+        # For unsupported file types, we return empty skip lists
+        return []
 
     # get tasks from blocks of tasks
     pyyaml_tasks = _get_tasks_from_blocks(pyyaml_task_blocks)