[IMP] core: avoid extra invalidate of compute no-store field.

`tocompute` in the `Transaction` contains store field on records to
be recomputed. No-store compute fields are directly invalidated from
the cache when a dependency changes (see `BaseModel.modified`).

In fact, `_recompute_field` was actually doing too much for nothing.
Also, it may invalidate caches of compute no-store fields for no reason
(e.g., if they are searchable). Remove the part for field compute
no-store field. And prevent `_recompute_field` callers from calling it
with no-store fields.

closes odoo/odoo#121355

Signed-off-by: Raphael Collet <rco@odoo.com>