[Vue] correctly destroy vue entry components in widgetloader #19216
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Description:
The code used to destroy existing content before it gets replaced in WidgetLoader did not destroy vue components, so effects like watches/computed properties might not be cleaned up properly when switching widgets. Fixed by this PR.
Not sure if this can go into 4.10, but it would be good for it to if possible.
CC @justinvelluppillai
Review