[skip ci] clean up around initializer

ml-agents/mlagents/trainers/learn.py

     }
     print(f"plugins available {discovered_plugins}")
 
-    all_initializers = set(get_all_subclasses(Initializer))
+    all_initializers = list(get_all_subclasses(Initializer))
+    print("Registering new initializer")
+    print(f"Found {len(all_initializers)} new initializers")
+    distributed_init = all_initializers[0]()
+    distributed_init.load()
-    new_initializers = all_initializers - original_initializers
-    print(f"Found {len(new_initializers)} new initializers")
-    print(all_initializers)
-    print(new_initializers)
     print(all_trainers)
     print(new_trainers)