fix: sqlglot losses all CTE statements

Author: chelsea-lin

bigframes/core/compile/sqlglot/sqlglot_ir.py

@@ -625,14 +625,14 @@ def _select_to_cte(expr: sge.Select, cte_name: sge.Identifier) -> sge.Select:
     into a new CTE and then generates a 'SELECT * FROM new_cte_name'
     for the new query."""
     select_expr = expr.copy()
-    existing_ctes = select_expr.args.pop("with", [])
+    existing_ctes = select_expr.args.pop("with_", [])
     new_cte = sge.CTE(
         this=select_expr,
         alias=cte_name,
     )
     new_with_clause = sge.With(expressions=[*existing_ctes, new_cte])
     new_select_expr = sge.Select().select(sge.Star()).from_(sge.Table(this=cte_name))
-    new_select_expr.set("with", new_with_clause)
+    new_select_expr.set("with_", new_with_clause)
     return new_select_expr