clfilter: remove usage of `range` in favor of iteration over changelog
If we want to apply filtering at changelog level, we need to iterate over it.
See previous changeset description for details.
Ancestors of 5
4 2 0
Ancestors of 6 and 5
3 4 2 1 0
Ancestors of 5 and 4
4 2 0
Ancestors of 7, stop at 6
6
Descendants of 5
7 8
Descendants of 5 and 3
6 7 8
Descendants of 5 and 4
5 7 8