Standard `sale` tax flows rely on `_get_tax_included_price_unit`,
whereas part of `website_sale` flows do, while another part relies
on `_fix_tax_included_price_company`, which doesn't handle some
advanced cases (fiscal position mapping of price_included taxes).
This commit drops the use of `_fix_tax_included_price_company` in
website_sale, to only use the newest API of `_get_tax_included_price_unit`,
supposed to handle more cases.
Also makes all taxes computation go through a single entry point,
`_apply_taxes_to_price`, already used for `combination_info` logic (/shop/product),
but not in `_get_sales_prices` (/shop page).
opw-3700803
original commit : 662ea281515156a781ab68079d0123ea45ebf40f
closesodoo/odoo#160198
Signed-off-by: Laurent Smet (las) <las@odoo.com>
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>