[IMP] website: enhance http error pages

- The traceback is only visible if in debug mode or if edit mode.

- All except_orm exceptions are now displayed as a 400
but the AccessError wich is a 403. There is now a dedicted page
for the 400 error.

- Errors messages are no longer the exception args but its name if the
exception is an except_orm. Else there is no message since the current
logic override exceptions of type Exception in ir_http thus we have
no message to display.

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

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