Simply reimplement pluralize for partial success

core/dbt/events/types.py

@@ -1927,17 +1927,9 @@ def code(self) -> str:
         return "Z030"
 
     def message(self) -> str:
-
-        class PartialSuccess:
-            def __str__(self) -> str:
-                return "partial success"
-
-            def pluralize(self) -> str:
-                return f"{self}es"
-
         error_plural = pluralize(self.num_errors, "error")
         warn_plural = pluralize(self.num_warnings, "warning")
-        partial_success_plural = pluralize(self.num_partial_success, PartialSuccess())
+        partial_success_plural = f"""{self.num_partial_success} partial {"success" if self.num_partial_success == 1 else "successes"}"""
 
         if self.keyboard_interrupt:
             message = yellow("Exited because of keyboard interrupt")