[ML][TEST] Clean up max_model_memory_limit cluster setting
Removes the `xpack.ml.max_model_memory_limit` cluster setting
at the teardown of the `ml_info.yml` tests to ensure the setting
does not trip other tests.
+teardown:
+
+ - do:
+ cluster.put_settings:
+ body:
+ persistent:
+ xpack.ml.max_model_memory_limit: null
+
---
"Test ml info":
- do:
