[IMP] base, web, *: make KarmaError an except_orm

* = gamification, test_website, stock

- KarmaError is now handled as a 400 exception.
- test_website has been updated.
- NO_POSTMORTEM is now clean it was referencing duplicates as most the
  exceptions inherit from except_orm.
- serialize_exception from http.py has been moved to ir_http
  to take advantage of the odoo inheritance system. We can then
  extend ir_http serialize_exception method to add the KarmaError
  logic if and only if gamification is installed.
  Places where serialize_exception was previously used are updated.

Part of https://github.com/odoo/odoo/pull/32132
task-1894820

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