[FIX] crm: reset dashboard_graph_model on uninstall

Before this commit:
    * Install `sale_management`, `crm`
    * Uninstall `crm`
    * Go to sales -> sales channels
    * Boom! The view is broken

This happens because both CRM and Sales share the sales teams view, yet
CRM's override of the model adds a selection_add to the
dashboard_graph_model selection field, when it is uninstalled, records
whose dashboard_graph_model field are set to one of the values
introduced by CRM keep this no-longer-valid value and upon accessing the
view it crashes.

This is a known limitation of selection fields and the selection_add
feature.

To solve this, an uninstallation hook has been created for CRM which
will fetch all records whose dashboard_graph_model is set to
`crm.opportunity.report`, and update the field of all these records to
None (NULL).

Fixes #25363

addons/crm/__init__.py

@@ -5,3 +5,11 @@ from . import controllers
 from . import models
 from . import report
 from . import wizard
+
+from odoo import api, SUPERUSER_ID
+
+
+def uninstall_hook(cr, registry):
+    env = api.Environment(cr, SUPERUSER_ID, {})
+    teams = env['crm.team'].search([('dashboard_graph_model', '=', 'crm.opportunity.report')])
+    teams.update({'dashboard_graph_model': None})

addons/crm/__manifest__.py

@@ -57,4 +57,5 @@
     'installable': True,
     'application': True,
     'auto_install': False,
+    'uninstall_hook': 'uninstall_hook',
 }