Variant Selector: Hint badge should render in append slot #20504
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Fix minor mistake where umb-badge did not have the slot attribute defined — this is only needed for the variant-selector badge.
Additionally makes the badge go on top of the dashed-line appearing on not-created variants.
Test notes:
Trigger a validation issue on a variant and navigate to another one, a badge should appear on the variant-selector to lead the user back to correct the issue.