[IMP] website_crm_partner_assign: show assigned partner on opportunity kanban

This commit display the assigned parter on kanban view of opportunities next
to the partner (if assigned parter is set). For example, if the customer name
is 'Main Contact' and assigned partner's name is 'Assigned Contact', it will
appear in following format:

Main Contact → Assigned Contact

If there is no customer and only assignd parner, it will look like

→ Assigned Contact

Note that if there is only customer, or no assigned partner and no customer,
nothing changes in the view.

taskID-2443894
closes https://github.com/odoo/odoo/pull/67524

Part-of: odoo/odoo#67524

addons/website_crm_partner_assign/views/crm_lead_views.xml

@@ -136,4 +136,26 @@
                 </xpath>
             </field>
         </record>
+
+        <record id="crm_lead_view_kanban" model="ir.ui.view">
+            <field name="name">crm.lead.view.kanban.inherit.website.crm.partner.assign</field>
+            <field name="model">crm.lead</field>
+            <field name="inherit_id" ref="crm.crm_case_kanban_view_leads"/>
+            <field name="arch" type="xml">
+                <field name="user_id" position="after">
+                    <field name="partner_assigned_id"/>
+                </field>
+                <xpath expr="//span[@t-esc='record.partner_id.value']" position="replace">
+                    <t t-if="record.partner_id.value or record.partner_assigned_id.value">
+                        <span class="o_text_overflow">
+                            <t t-esc="record.partner_id.value"/>
+                            <t t-if="record.partner_assigned_id.value">
+                                <i class="fa fa-arrow-circle-right" aria-label="Arrow icon" title="Arrow"/>
+                                <t t-esc="record.partner_assigned_id.value"/>
+                            </t>
+                        </span>
+                    </t>
+                </xpath>
+            </field>
+        </record>
 </odoo>