[IMP] mrp: Productivity Losses usability improvements

Rename 'Reason' in 'Blocking Reasons'.
Rename 'Effectiveness Category' in 'Category'.
Remove 'Is a Blocking Reason'.
'manual' field become a technical field.
workorder: Change label Efficiency -> Productivity.

The purpose is to make it easier for the user and remove
blocking keywork since it's already in productivity losses views.

Related to task: 58625
PR #23341

addons/mrp/views/mrp_workcenter_views.xml

@@ -466,9 +466,8 @@
         <field name="arch" type="xml">
             <tree string="Workcenter Productivity Loss">
                 <field name="sequence" widget="handle"/>
-                <field name="name"/>
-                <field name="loss_type"/>
-                <field name="manual"/>
+                <field name="name" string="Blocking Reasons"/>
+                <field name="loss_type" string="Category"/>
             </tree>
         </field>
     </record>
@@ -519,7 +518,7 @@
         <field name="res_model">mrp.workcenter.productivity.loss</field>
         <field name="view_type">form</field>
         <field name="view_mode">tree,kanban,form</field>
-        <field name="domain">[]</field>
+        <field name="domain">[('manual', '=', 'True')]</field>
         <field name="help" type="html">
           <p class="o_view_nocontent_empty_folder">
             No productivity loss defined

addons/mrp/views/mrp_workorder_views.xml

@@ -203,7 +203,7 @@
                                 <field name="duration" widget="float_time" sum="Total duration"/>
                                 <field name="user_id"/>
                                 <field name="workcenter_id" invisible="1"/>
-                                <field name="loss_id" string="Efficiency"/>
+                                <field name="loss_id" string="Productivity"/>
                             </tree>
                             <form>
                                 <group>