[FIX] *: use `auth='public'` in controllers that use `request.env`

The following trick used to work, because `sudo()` was actually making
an environment for the superuser to operate upon:

request.env[...].sudo().method(...)

It no longer works in general, since `sudo()` now makes an environment
in superuser mode but with `uid=None`!  It may still work by accident
for operations that never use `env.uid`, but is broken in general.

Using `auth='public'` fixes the problem by using the public user when no
user is available.

closes odoo/odoo#34297

Signed-off-by: Olivier Dony (odo) <odo@openerp.com>

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