[16.0] hr_holidays_leave_auto_approve is not passing unit test in CI

[pcastelovigo]

Seems that hr_holiday logic has changed

2025-11-22 23:48:17,220 337 ERROR odoo odoo.addons.hr_holidays_leave_auto_approve.tests.test_hr_holidays_leave_auto_approve: ERROR: TestHolidaysAutoValidate.test_leave_requests_state
Traceback (most recent call last):
  File "/__w/hr-holidays/hr-holidays/hr_holidays_leave_auto_approve/tests/test_hr_holidays_leave_auto_approve.py", line 70, in test_leave_requests_state
    leave1 = self.leave_request_model.create(
  File "<decorator-gen-318>", line 2, in create
  File "/opt/odoo/odoo/api.py", line 430, in _model_create_multi
    return create(self, [arg])
  File "/__w/hr-holidays/hr-holidays/hr_holidays_leave_auto_approve/models/hr_leave.py", line 38, in create
    res._apply_auto_approve_policy()
  File "/__w/hr-holidays/hr-holidays/hr_holidays_leave_auto_approve/models/hr_leave.py", line 21, in _apply_auto_approve_policy
    self.filtered(lambda r: r._should_auto_approve()).sudo().action_approve()
  File "/opt/odoo/addons/hr_holidays/models/hr_leave.py", line 1253, in action_approve
    self.filtered(lambda hol: not hol.validation_type == 'both').action_validate()
  File "/opt/odoo/addons/hr_holidays/models/hr_leave.py", line 1277, in action_validate
    raise ValidationError(_('The following employees are not supposed to work during that period:\n %s') % ','.join(leaves.mapped('employee_id.name')))
odoo.exceptions.ValidationError: The following employees are not supposed to work during that period:
 Test Employee
 

[pcastelovigo]

Unit test tested function asking for a leave using datetime.today.
If CI was run in saturday or sunday, asking for a leave raised a ValidationError as it is not a working day.

I modified the test to be sure that selected day is between monday and friday, making test to be valid also when run on weekends

PR #231