[FIX] website: fix authentication of archived visitor

If a visitor logs in (and has a visitor_id in his cookie), the partner will be
linked to the visitor. If, after 1 week, the visitor tries to connect again
with a different session (or another visitor_id in cookies), the authenticate
will crash because

  * _cron_archive_visitors applies on visitor inactive since at least a week
  * there can be only one visitor per partner (sql constraint)
  * the visitor linked to the partner is not retrieved (because archived) and
  we try to link the partner to a new visitor.

Further than that, if the visitor is archived and the linked partner wants to
login again with a new visitor_id, we should

  * reactivate the previous visitor,
  * copy history from newest to previous one,
  * delete the newest one

Note that last two points were already done before this commit.

Task ID: 2120464
PR #40199
Fixes #40077
Fixes #40301

closes odoo/odoo#41273

Original-signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
X-original-commit: 53a6bed3b5c1ae09be490254ed09f18acbb970c4
Signed-off-by: David Beguin <dbeguin@users.noreply.github.com>

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