[FIX] bus: longpolling clears its handlers correctly
[FIX] bus: longpolling clears its handlers correctly

`this._id` is overriden by the crosstab_bus, so the event handlers
weren't unbound at destroy.

Manual forwardport of odoo/odoo#31578, as we need this for another
branch, in which it makes tests fail.

closes odoo/odoo#31579

Signed-off-by: VincentSchippefilt <b3d773ca0fcfdcd8ee97e2eadfa646f4a4256898@users.noreply.github.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo