sql/execbuilder: specify the column family with jsonb_path_query tests

Previously we didn't specify the column family in the definition of the
table, leading to inderterministic for Scan response from kvbatcher. This
commit is to fix it with explicitly set the column family.

Release note: None

Author: ZhouXing19

pkg/sql/opt/exec/execbuilder/testdata/jsonb_path_query

@@ -4,7 +4,8 @@
 statement ok
 CREATE TABLE json_tab (
   a INT PRIMARY KEY,
-  b JSONB
+  b JSONB,
+  FAMILY f1 (a, b)
 )
 
 statement ok