Remove undocumented property which does not pass mypy checks after an…

…notations in dbt-common. (#10529)

core/dbt/context/providers.py

@@ -974,7 +974,7 @@ def load_agate_table(self) -> "agate.Table":
             table = agate_helper.from_csv(path, text_columns=column_types, delimiter=delimiter)
         except ValueError as e:
             raise LoadAgateTableValueError(e, node=self.model)
-        table.original_abspath = os.path.abspath(path)
+
         return table
 
     @contextproperty()