Always pass a PVF along with its executor params

[s0me0ne-unkn0wn]

In #6161, a new structure called PvfWithExecutorParams was designed to carry exhaustive information needed by the executor to execute a PVF. However, its older sibling, called Pvf, is still there, as global refactoring was out of the scope of the original PR. Therefore, we need to research if the Pvf structure has become redundant indeed, and if it is, get rid of it and use PvfWithExecutorParams everywhere.

It is also worth noting that in most cases, there's no need to pass ExecutorParams by value (as a standalone structure or encapsulated into PvfWithExecutorParams). On its way to the executor, it gets SCALE-encoded and recreated on another end several times, so it would be safe to have an Arc reference to it instead of passing everywhere by value.