Fix ProgressBar dark mode rendering inconsistency across style variants#14551

LeafShi1 wants to merge 4 commits into

dotnet:maindotnet/winforms:mainfrom

LeafShi1:Fix_14546_ProgressBar_broken_appearance_in_DarkModeLeafShi1/winforms:Fix_14546_ProgressBar_broken_appearance_in_DarkModeCopy head branch name to clipboard