[FIX] website_blog: speed up loading blog posts when there are many
[FIX] website_blog: speed up loading blog posts when there are many

Doing filtered on all_post is problematic in case there are many
blog.post records (>5000 were observed). It will trigger prefetching
which will run the content fields through html_translate which can
take many seconds to complete.

Instead replace the filtered call with a more precise search domain.

opw-2060704, opw-2060706

closes odoo/odoo#36207

Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo