[MOV] payment: rename test files

`test_payments` -> `test_account_payment`
`test_transactions` -> `test_payment_transaction`

Task - 2848326

Part-of: odoo/odoo#90716

addons/payment/tests/__init__.py

@@ -2,7 +2,7 @@
 
 from . import common
 from . import http_common
+from . import test_account_payment
 from . import test_flows
 from . import test_multicompany_flows
-from . import test_payments
-from . import test_transactions
+from . import test_payment_transaction

addons/payment/tests/test_account_payment.py

@@ -8,7 +8,7 @@ from odoo.addons.payment.tests.common import PaymentCommon
 
 
 @tagged('-at_install', 'post_install')
-class TestPayments(PaymentCommon):
+class TestAccountPayment(PaymentCommon):
 
     def test_no_amount_available_for_refund_when_not_supported(self):
         self.acquirer.support_refund = False

addons/payment/tests/test_payment_transaction.py

@@ -6,7 +6,7 @@ from odoo.addons.payment.tests.common import PaymentCommon
 
 
 @tagged('-at_install', 'post_install')
-class TestTransactions(PaymentCommon):
+class TestPaymentTransaction(PaymentCommon):
 
     def test_refunds_count(self):
         self.acquirer.support_refund = 'full_only'  # Should simply not be False