[IMP] project_timesheet_holidays: change test class

We try to define common classes in test with helpers to
set testing data. Here, we had a test extended a class
with test methods, making those tests executed twice:
when hr_timesheet was installed, and on project_timesheet_holidays
installation.
This is not very stable, as some behavior might change when
other are installed.

closes #29538

addons/project_timesheet_holidays/tests/test_timesheet_holidays.py

@@ -7,7 +7,7 @@
 from odoo import fields
 
 from odoo.tests import common
-from odoo.addons.hr_timesheet.tests.test_timesheet import TestTimesheet
+from odoo.addons.hr_timesheet.tests.test_timesheet import TestCommonTimesheet
 
 
 class TestTimesheetHolidaysCreate(common.TransactionCase):
@@ -24,7 +24,7 @@ def test_status_create(self):
         self.assertEqual(status.timesheet_task_id, company.leave_timesheet_task_id, 'The default task linked to the status should be the same as the company')
 
 
-class TestTimesheetHolidays(TestTimesheet):
+class TestTimesheetHolidays(TestCommonTimesheet):
 
     def setUp(self):
         super(TestTimesheetHolidays, self).setUp()