[FIX] website: Unlink several website.page records
[FIX] website: Unlink several website.page records

Avoid singleton error

This commit closes #26825

Partial backport of saas-15 - multiwebsite commit

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo