feat(manager/helm): make change log url retrieval more flexible (#16210)

* feat(helm): improve fallback on sourceUrl selection

* fix(helm): use home and source from latest release

instead of the first. Otherwise those fields can't be ever changed.

* test(helm): test charts with no home metadata

* test(helm): test releases semver sorting

* fix(helm): select last release by semver

* Apply suggestions from code review

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

* fix(type): make homeMatch keys optional

* Fixes

Co-authored-by: Stefano Zaninetta <stefano.zaninetta@nagra.com>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>