[FIX] maintenance_product: test post_install to avoid error on partner creation

Author: christian-ramos-tecnativa

maintenance_product/tests/test_maintenance_product.py

@@ -1,11 +1,12 @@
 # Copyright 2022 Tecnativa - Víctor Martínez
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
-from odoo.tests import Form
+from odoo.tests import Form, tagged
 
 from .common import TestMaintenanceProductBase
 
 
+@tagged("post_install", "-at_install")
 class TestMaintenanceProduct(TestMaintenanceProductBase):
     @classmethod
     def setUpClass(cls):