[FIX] account: avoid invisible product_uom_id

For a non well identified reason, the user doesn't have the uom group
to see the field during the test.

this commit adds the group to the user to make it visible during
the test as a simple fix.

closes odoo/odoo#95741

Signed-off-by: Denis Ledoux (dle) <dle@odoo.com>

addons/account/tests/test_account_move_in_invoice.py

@@ -125,6 +125,7 @@ class TestAccountMoveInInvoiceOnchanges(AccountTestInvoicingCommon):
             'amount_tax': 168.0,
             'amount_total': 1128.0,
         }
+        cls.env.user.groups_id += cls.env.ref('uom.group_uom')
 
     def setUp(self):
         super(TestAccountMoveInInvoiceOnchanges, self).setUp()

addons/account/tests/test_account_move_out_invoice.py

@@ -128,6 +128,7 @@ class TestAccountMoveOutInvoiceOnchanges(AccountTestInvoicingCommon):
             'amount_tax': 210.0,
             'amount_total': 1410.0,
         }
+        cls.env.user.groups_id += cls.env.ref('uom.group_uom')
 
     def setUp(self):
         super(TestAccountMoveOutInvoiceOnchanges, self).setUp()