Bug
===
If we
1. Open a lead with an email but without partner
2. Set a partner without email on the lead
3. The warning "The email will be propagated" is visible
4. When saving the form, the email is not propagated even if the
   warning message was visible

Solution
========
The reason is that, as the email was not changed, the inverse method
of this field was not called and so the email was not propagated.

The best solution would be to use "force_save" on those fields. But
this feature only works on readonly fields.

So, we simulate a real "force_save" on the email / phone, directly in
JS. That way the inverse will be called, and if necessary, the email /
phone will be propagated.

Task-2704904

closes odoo/odoo#83934

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Co-authored-by: flch-odoo <flch@odoo.com>