[IMP] mail: add optional encapsulation layout when sending template-based emails

This commit adds possibility to add a notification layout when sending
an email based on a template using the send_mail method. Purpose of this
task is to allow to send some technical template-based emails using the
default notification layouts defined in mail. It allows to avoid redefining
the whole layout in the template itself.

Target of this commit is some technical templates that are send only by
email. Customer email have currently no way of choosing this notification
layout.

This commit is linked to task ID 1868112 and to PR #25889.

0 files changed, 0 insertions, 0 deletions