It is sometimes desirable to completely remove a field
from the automated tracking message
when setting a custom message that already covers the change being made.
Add a filtering method on threads to allow models to selectively
hide tracking values from emails and messages.
task-2974500
closesodoo/odoo#109606
Related: odoo/enterprise#31795
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>