ccl/changefeedccl: deflake TestChangefeedNemeses

Previously, this test would fail when the legacy schema changer was used
because tables would be created with schema_locked. This patch avoids
creating tables with schema_locked if the legacy scheam chagner is being
test.

Fixes: #148927
Fixes: #148940

Release note: None

Author: fqazi

pkg/ccl/changefeedccl/nemeses_test.go

@@ -38,8 +38,11 @@ func TestChangefeedNemeses(t *testing.T) {
 			withLegacySchemaChanger := nop.EnableSQLSmith || rng.Float32() < 0.1
 			if withLegacySchemaChanger {
 				t.Log("using legacy schema changer")
+				sqlDB.Exec(t, "SET create_table_with_schema_locked=false")
 				sqlDB.Exec(t, "SET use_declarative_schema_changer='off'")
-				sqlDB.Exec(t, "SET CLUSTER SETTING  sql.defaults.use_declarative_schema_changer='off'")
+				sqlDB.Exec(t, "SET CLUSTER SETTING sql.defaults.use_declarative_schema_changer='off'")
+				sqlDB.Exec(t, "SET CLUSTER SETTING sql.defaults.create_table_with_schema_locked='false'")
+
 			}
 			v, err := cdctest.RunNemesis(f, s.DB, t.Name(), withLegacySchemaChanger, rng, nop)
 			if err != nil {