[FIX] sale_quotation_builder: quotation_description sanitize_attributes=False

quotation_description on the sale order is copied from the
product template, where it already is sanitize_attributes=False,
and it has to stay like that because otherwise widgets like
"tab" or "accordion" cannot be rendered correctly.

This is also linked to a bug in the ORM where the _related_attrs
weren't copied correctly.

Related ORM PR: https://github.com/odoo/odoo/pull/78687
Ticket link: https://www.odoo.com/web#id=2487749&model=project.task



opw-2487749

closes odoo/odoo#78818

X-original-commit: ee90f6bc
Signed-off-by: Paolo Gatti <lordkrandel@users.noreply.github.com>