This PR prepares the ground for the one introducing the new environment in the
mail module. Indeed, the mail_bot messaging_initializer relies on the session
in order to known when to initiaze odoobot. With the new env, we won't be able
to access the session but will instead override init_messaging to automatically
initialize odoobot. Doing this first reduces the noise in the main PR.
task-2582313
closesodoo/odoo#90291
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>
tsm-odoo
4549de3b61