Don't print <Shared ...> for a proc mesh

Pull Request resolved: #1726

bit rotted over time, I think....

Differential Revision: [D85977155](https://our.internmc.facebook.com/intern/diff/D85977155/)

**NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D85977155/)!
ghstack-source-id: 320493873

Author: zdevito

python/monarch/_src/actor/v1/proc_mesh.py

@@ -283,12 +283,6 @@ async def task(
 
         return pm
 
-    def __repr__(self) -> str:
-        return repr(self._proc_mesh)
-
-    def __str__(self) -> str:
-        return str(self._proc_mesh)
-
     def _spawn_nonblocking(
         self, name: str, Class: Type[TActor], *args: Any, **kwargs: Any
     ) -> TActor: