[FIX] web, *: make crash_manager use services correctly

* = website_forum, stock

Fix for: https://github.com/odoo/odoo/pull/32132

crash_manager.js was using the services while bypassing
ServiceProviderMixin That means all services are duplicated, each having
their own state.
To fix this issue, CrashManager now extends AbstractService. Also
crash_manager is now registered in serviceRegistry instead of being
instanciated on the fly.

The crash_manager now being a Service raise one issue with the tests:
The services are not run for the tests but some tests needs the
crash_manager 'unhandledrejection' listener. For that matter the
services are reenable in qunit. Also the crash_manager's
'unhandledrejection' listener has to have precedence over the qunit
listener as it will handle rejections wich have no reason or are not
Errors.

Part of: https://github.com/odoo/odoo/pull/35209