Only the add_sign from notif_values is usefull for a resend. We can consider
that a mail on resend can be delete in every case, and we can find the
model_description from model since a resend can only be performed on
message linked to a model.
The other notif_values are now parameter in order to ease the understanding
of what can transit through this flow.
Task: #1860054
PR: #25622
XavierDo
c8d283a592