test: add test for Postgre upsertBatch()

[kenjis]

Description

• add test

        $data = [
            // new row insert
            [
                'type_varchar'  => 'insert', // Key
                'type_bigint'   => 9_999_999,
                'type_date'     => '2024-01-01',
                'type_datetime' => '2024-01-01 09:00:00',
            ],
            // update
            [
                'type_varchar'  => 'test1', // Key
                'type_bigint'   => 9_999_999,
                'type_date'     => '2024-01-01',
                'type_datetime' => '2024-01-01 09:00:00',
            ],
        ];

        $builder->onConstraint('type_varchar')->upsertBatch($data);

INSERT INTO "db_type_test" ("type_bigint", "type_date", "type_datetime", "type_varchar")
VALUES (9999999,'2024-01-01','2024-01-01 09:00:00','insert'), (9999999,'2024-01-01','2024-01-01 09:00:00','test1')
ON CONFLICT("type_varchar")
DO UPDATE SET
"type_bigint" = "excluded"."type_bigint",
"type_date" = "excluded"."type_date",
"type_datetime" = "excluded"."type_datetime"

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[sclubricants]

Looks good