[REF] web: remove custom frontend code since done by crashmanager
[REF] web: remove custom frontend code since done by crashmanager

The handling of unhandledrejection in the frontend was done with
dedicated code since the crashmanager was not in the frontend. This is
the case now so that dedicated code became useless.

closes odoo/odoo#42927

Signed-off-by: fja-odoo <5eba2c8f57f61930a663320ac0a16372f335cda8@users.noreply.github.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo