[#23786] YSQL: add yb_make_next_ddl_statement_nonincrementing to YbDb…

…AdminVariables

Summary:
The yb_make_next_ddl_statement_nonincrementing has PGC_SUSET and needs to be
added to YbDbAdminVariables in order for yb_db_admin role to set it. Otherwise,
we see permission denied error for yb_db_admin:

```
yugabyte=# set role yb_db_admin;
SET
yugabyte=> set yb_make_next_ddl_statement_nonincrementing to true;
ERROR:  permission denied to set parameter "yb_make_next_ddl_statement_nonincrementing"
```

I added yb_make_next_ddl_statement_nonincrementing to YbDbAdminVariables, and
the above error is gone

```
yugabyte=# set role yb_db_admin;
SET
yugabyte=> set yb_make_next_ddl_statement_nonincrementing to true;
SET
```
Jira: DB-12689

Test Plan: ./yb_build.sh --cxx-test pg_catalog_version-test --gtest_filter PgCatalogVersionTest.NonIncrementingDDLMode

Reviewers: kfranz

Reviewed By: kfranz

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D38135

src/postgres/src/backend/utils/misc/guc.c

@@ -5637,6 +5637,7 @@ static const char *const map_old_guc_names[] = {
 static const char *const YbDbAdminVariables[] = {
 	"session_replication_role",
 	"yb_make_next_ddl_statement_nonbreaking",
+	"yb_make_next_ddl_statement_nonincrementing",
 };
 
 

src/yb/yql/pgwrapper/pg_catalog_version-test.cc

@@ -1536,6 +1536,7 @@ TEST_F(PgCatalogVersionTest, NonIncrementingDDLMode) {
   const string kDatabaseName = "yugabyte";
 
   auto conn = ASSERT_RESULT(ConnectToDB(kDatabaseName));
+  ASSERT_OK(conn.Execute("SET ROLE yb_db_admin"));
   ASSERT_OK(conn.Execute("CREATE TABLE t1(a int)"));
   auto version = ASSERT_RESULT(GetCatalogVersion(&conn));