[IMP] base: remove the 'Shared contacts book' general setting

The Common partner contact setting is removed from general settings because its
behavior wasn't really clean from a technical point of view
(disabling the rule on partner access) and wouldn't work as well with new
multi-company logic.

The default logic of sharing partner will be kept, but when someone wants to
limit partner sharing, he will do so partner by partner, by
setting the company_id.
Also, the default company_id on a partner will be blank so default partner
will be a sharable by multi-company.

when the partner is created at the time of user creation then the partner's
company will be the same as user's company.and when the partner is created at
the time of company creation(partner related to company) then the company of
partner will be newly created company.

task-2024446
Closes: #35266