[IMP] project: add default project group by on stage views

Purpose of this commit help the user identify which stage is linked
to what project, and what workflow each project has by grouping
them by project.

So, in this commit group the stage list and kanban view by project.

task-3165202

Part-of: odoo/odoo#112620

addons/project/views/project_task_type_views.xml

@@ -84,6 +84,9 @@
             <field name="mode">primary</field>
             <field name="inherit_id" ref="task_type_tree"/>
             <field name="arch" type="xml">
+                <xpath expr="//tree" position="attributes">
+                    <attribute name="default_group_by">project_ids</attribute>
+                </xpath>
                 <xpath expr="//field[@name='name']" position="after">
                     <field name="mail_template_id" optional="hide"/>
                     <field name="rating_template_id" optional="hide" groups="project.group_project_rating"/>
@@ -96,7 +99,7 @@
             <field name="name">project.task.type.kanban</field>
             <field name="model">project.task.type</field>
             <field name="arch" type="xml">
-                <kanban class="o_kanban_mobile" sample="1">
+                <kanban class="o_kanban_mobile" sample="1" default_group_by="project_ids">
                     <field name="name"/>
                     <field name="fold"/>
                     <field name="description"/>