Purpose of this commit is to send a mail template to the user
who invited other user(s) in Odoo.
It informs the user about the details of user(s) who have been
invited by him but have still not registered after the given days
of creation (default set to -> 5days)
task-1912449
Closes#31582
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
