code: def find_removed_types(
      old_schema: GraphQLSchema, new_schema: GraphQLSchema
  ) -> List[BreakingChange]:
      
      old_type_map = old_schema.type_map
      new_type_map = new_schema.type_map
  
      breaking_changes = []
      for type_name in old_type_map:
          if type_name not in new_type_map:
              breaking_changes.append(
                  BreakingChange(
                      BreakingChangeType.TYPE_REMOVED, f"{type_name} was removed."
                  )
              )
      return breaking_changes
docs: Find removed types.
  
      Given two schemas, returns a list containing descriptions of any breaking changes
      in the newSchema related to removing an entire type.