[IMP] product: product & template name_get performance

By prefetching only the fields required for the `name_get`

`product.product` & `product.template`
have a huge number of fields,
and prefetching them just to compute
the name is overkill.

Especially, as the browse was done using
sudo, the prefetch was a bit useless as
it was stored in the sudo user cache,
which was most-likely not used afterwards
by the callee of name_get

For a database with 50.000 products,
this reduce the processing time
by 15 (from 60 seconds to 4 seconds measured)

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