Odoo Release Updates

[FIX] *: automaticaly set legacy at_install

[IMP] (test_)whatsapp: avoid sending sample values in composer

[REF] mail_enterprise, *: rename Thread JS model to mail.thread

[FIX] whatsapp: move showSeenIndicator to message model

[REF] all: model's description should be singular

[FIX] whatsapp: message translation for agent when not member

[REF] ai,whatsapp: correspondant avatar is now the default value

[IMP] ai,whatsapp: use channel_type from channel model

[FIX] whatsapp: prevent fails in command palette tests