Remove partial dependency in PCSContainerService (#405)

Summary:
X-link: facebookresearch/fbpcp#405

We decided that validate_container_definitions should not be a public API in container service. This diff is to remove it and resolve the conflict.

The validation logic has been moved in D38629555, to ensure the backward compatibility, we firstly changed the function body to ``pass``.

Differential Revision: D38604420

fbshipit-source-id: 9d9d6480863ea9ebb68ca5a84c53cc2aecf8ddfe

fbpcs/common/service/pcs_container_service.py

@@ -81,6 +81,4 @@ def get_current_instances_count(self) -> int:
         return self.inner_container_service.get_current_instances_count()
 
     def validate_container_definition(self, container_definition: str) -> None:
-        return self.inner_container_service.validate_container_definition(
-            container_definition
-        )
+        pass