Feat: Added confirmation warning messages to change tariff and terminate contract wizards
CHANGELOG:
### ADDED
- [#1194](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1194) Added new warning confirmation message to change tariff wizzard and added condition to terminate contract warning message
Related card: https://trello.com/c/2WVEXYmF/1861-av%C3%ADs-de-canvis-de-tarifa-sortints-de-pinya-i-o-compartides