Fix missing URL redirection implementation in web engine feeding from KIO

Friedrich W. H. Kossebaurequested to merge
work/kossebau/fixmissingurlredirectsupport into master

Resulted in broken URLs generated from URL set for pages and the relative URLs used in the pages.

@ltoscano @nicolasfella @heikobecker

Backport candidate for 24.02.2

CCBUG: 484176

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