Previously when creating an applicant through the calendar application,
no activity would be created making the newly created record not show up
in the calendar because it depends on the activities linked to the
record.
A calendar event will now be created upon creation through the calendar
view in order for the applicant to be displayed directly.
Also fixes an issue where if no contact is set on the application it
would prevent you from refusing it.
TaskId-2641495
closesodoo/odoo#76831
Signed-off-by: Kevin Baptiste <kba@odoo.com>