[5.3] Avoid redundant "where" clauses on multiple calls to forPageAfterId()

[vlakoff]

Alternative to #16498.

Also filtering without using Collections, I think it's clearer this way (and about 10x faster).
Note the current code may receive Collection::make(null), thankfully this was working still.

[taylorotwell]

This seems super fragile.

[vlakoff]

Indeed, as I was about to post this:

What about if, for instance, a max id had been specified? like:

$query->where('id', '<', 100)->forPageAfterId(...);
$query->where('id', '<', 100)->chunkById(...);

Currently, this PR would drop it. This example case could easily be prevented, by making the filter more precise. Though I guess similar issues would emerge later.