[IMP] account_banking_mandate_contact: test performance improvement

- Switch to setUpClass for avoiding repeat the same setup for each test.
- Include context keys for avoiding mail operations overhead.

account_banking_mandate_contact/tests/test_account_payment_order.py

@@ -4,21 +4,14 @@
 from odoo import fields
 from odoo.tests.common import Form, TransactionCase
 
+from odoo.addons.base.tests.common import DISABLED_MAIL_CONTEXT
+
 
 class TestAccountPaymentOrder(TransactionCase):
     @classmethod
     def setUpClass(cls):
         super().setUpClass()
-        cls.env = cls.env(
-            context=dict(
-                cls.env.context,
-                mail_create_nolog=True,
-                mail_create_nosubscribe=True,
-                mail_notrack=True,
-                no_reset_password=True,
-                tracking_disable=True,
-            )
-        )
+        cls.env = cls.env(context=dict(cls.env.context, **DISABLED_MAIL_CONTEXT))
         cls.partner = cls.env["res.partner"].create({"name": "Test Partner"})
         cls.product = cls.env["product.product"].create({"name": "Test product"})
         cls.partner_bank_core = cls._create_res_partner_bank("N-CORE")