[FIX] base: unlink custom cron after uninstalling model

When user uninstalls a module it doesn't unlinks custom crons
which are created by user and it will keep running in the background
and will generate traceback.

So, to fix this we unlink all the custom crons which are related to the
module being uninstalled.

sentry-3929309220

closes odoo/odoo#124175

X-original-commit: b0202488220bd48dd177e9e0601f2f3ba8d7a0f1
Signed-off-by: Fabien Pinckaers <fp@odoo.com>
Signed-off-by: Rahul Prajapati (rapr) <rapr@odoo.com>

odoo/addons/base/models/ir_actions.py

@@ -463,7 +463,7 @@ class IrActionsServer(models.Model):
     sequence = fields.Integer(default=5,
                               help="When dealing with multiple actions, the execution order is "
                                    "based on the sequence. Low number means high priority.")
-    model_id = fields.Many2one('ir.model', string='Model', required=True, ondelete='cascade',
+    model_id = fields.Many2one('ir.model', string='Model', required=True, ondelete='cascade', index=True,
                                help="Model on which the server action runs.")
     model_name = fields.Char(related='model_id.model', string='Model Name', readonly=True, store=True)
     # Python code

odoo/addons/base/models/ir_model.py

@@ -319,6 +319,11 @@ class IrModel(models.Model):
         # delete fields whose comodel is being removed
         self.env['ir.model.fields'].search([('relation', 'in', self.mapped('model'))]).unlink()
 
+        # delete ir_crons created by user
+        crons = self.env['ir.cron'].with_context(active_test=False).search([('model_id', 'in', self.ids)])
+        if crons:
+            crons.unlink()
+
         self._drop_table()
         res = super(IrModel, self).unlink()