Refs #30060, Refs #34217 -- Made SchemaEditor not generate SQL for CheckConstraint if not supported.

The new logic mirrors the logic in SchemaEditor._delete_check_sql()
added in 68ef274bc5.

Thanks Tim Graham for the report.

django/db/backends/base/schema.py

@@ -1726,6 +1726,8 @@ class BaseDatabaseSchemaEditor:
         }
 
     def _create_check_sql(self, model, name, check):
+        if not self.connection.features.supports_table_check_constraints:
+            return None
         return Statement(
             self.sql_create_check,
             table=Table(model._meta.db_table, self.quote_name),