[FIX] hr: allow to copy employee linked to user

Before this commit, It was not possible to copy An employee which is already linked to User due `user_uniq` constraints.

Now we add `copy=False` on `user_id` field, so Employee will be copied without linked User.

closes odoo/odoo#49915

X-original-commit: 2a63df03859166414be338c6655ee8c4052666b7
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr/models/__init__.py

@@ -14,3 +14,4 @@ from . import res_config_settings
 from . import res_partner
 from . import res_users
 from . import res_company
+from . import resource

addons/hr/models/resource.py

@@ -0,0 +1,10 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import fields, models
+
+
+class ResourceResource(models.Model):
+    _inherit = "resource.resource"
+
+    user_id = fields.Many2one(copy=False)