Remove assert that prevents WidgetSpans from being used in SelectableText #92295
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Partially resolves #38474
Manually removing this assert and using WidgetSpans seems to be stable in the wild. Since fully integrated selectable text/editable WidgetSpan support may take a significant effort but does not detract from simple use cases, we should remove this assert for now and gradually add richer support in as necessary. This unlocks WidgetSpan capability for anyone who does not need rich selection indexing and clipboards.
Tests coming soon.