BadgeOverlay: port to Kirigami.Badge

Nate Grahamrequested to merge
work/ngraham/port-overlaybadge-to-kirigami-badge into master

Reason for the change

Kirigami.Badge does the same thing, and the visuals are close enough to this custom component.

Test plan

Turn on badge for battery, bluetooth, or weather widget.

Screenshots or screen recordings

Before After
Before After

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