[FIX] hr: Expose employee timezone on public profile

Purpose
=======

It happens a lot that we access to the employee timezone to compute
presence states, leaves, ...

Instead of sudoing all those accesses, it looks better to expose this
data in the public profile.

closes odoo/odoo#35811

Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr/models/hr_employee_base.py

@@ -24,3 +24,6 @@ class HrEmployeeBase(models.AbstractModel):
     user_id = fields.Many2one('res.users')
     resource_id = fields.Many2one('resource.resource')
     resource_calendar_id = fields.Many2one('resource.calendar')
+    tz = fields.Selection(
+        string='Timezone', related='resource_id.tz', readonly=False,
+        help="This field is used in order to define in which timezone the resources will work.")

addons/hr/models/hr_employee_public.py

@@ -28,6 +28,7 @@ class HrEmployeePublic(models.Model):
     user_id = fields.Many2one(readonly=True)
     resource_id = fields.Many2one(readonly=True)
     resource_calendar_id = fields.Many2one(readonly=True)
+    tz = fields.Selection(readonly=True)
 
     # hr.employee.public specific fields
     child_ids = fields.One2many('hr.employee.public', 'parent_id', string='Direct subordinates', readonly=True)