[FIX] hr: allow to add stages to a job position.

In v9, stages are not shared by default. So when you create a new job position,
you need to specify manually which stages are available for this job position.
But the field stage_ids was not available.

addons/hr/hr_view.xml

@@ -326,6 +326,9 @@
                             <label for="description"/>
                             <field name="description"/>
                         </div>
+                        <group>
+                            <field name="stage_ids" widget="many2many_tags" options="{'no_create': True}" />
+                        </group>
                     </sheet>
                     <div class="oe_chatter">
                         <field name="message_follower_ids" widget="mail_followers"/>