[FIX] mail: clean context when running email action

The action_subtask method adds 'default_parent_id' to the context.
If the creation or edition of a subtasks triggers an email creation,
(e.g. if there is an automated action 'send email')
the default 'default_parent_id' is still in the context.
Therefore, it tries to create the email with an arbitrary foreign key
(since it is an existing record on the project.task model), or crashes.

Similar to 816f3861.

opw 1978498

closes odoo/odoo#33111

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

addons/mail/models/ir_actions.py

@@ -112,6 +112,7 @@ class ServerActions(models.Model):
         # with wrong values in subsequent operations
         cleaned_ctx = dict(self.env.context)
         cleaned_ctx.pop('default_type', None)
+        cleaned_ctx.pop('default_parent_id', None)
         action.template_id.with_context(cleaned_ctx).send_mail(self._context.get('active_id'), force_send=False, raise_exception=False)
         return False