PathMultiline: handle directly-bound QVector<QPolygonF>

The autotest in 811b15bd161d12e5c85e093f9f492a0c4fa278d6 only tested
what happens if the vector of polygons is passed via a QVariant to the
PathMultiline paths property.  But the intention (as documented) was to
literally support an object with Q_PROPERTY(QVector<QPolygonF> paths ...)
and binding that paths property to PathMultiline.paths.  In that case
it appears in QQuickPathMultiline::setPaths() as a QVariant<QJSValue>,
canConvert<QVector<QPolygonF>>() returns false, then
canConvert<QVariantList>() returns true.  Nevertheless each variant
in the QVariantList is a QPolygonF, as expected.  So we need another
check to detect this case.  Also added a test specifically for that.

Fixes: QTBUG-77929
Change-Id: I84d0a45326d5f007b8ba3cc9bb1fbccf0345d812
Reviewed-by: Paolo Angelelli <paolo.angelelli@qt.io>

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