Fix UI with huge window sizes

Nate Graham requested to merge work/ngraham/fix-kcm-with-huge-window-sizes into master

Using a KCM-within-a-KCM paradigm was not ideal and caused weird layout glitches. We can fix them all by changing the device list page to be a plain old Kirigami.ScrollablePage.

BUG: 461102 FIXED-IN: 5.27.6


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