Annotation context labels don't show up in 2D views

[emilk]

"Detect and track objects" log bounding boxes with class-ids pointing into an annotation context with labels, yet the labels don't show up in the 2D space view:

0.15.1

There should be labels above/below the boxes… I think?

If not, we should build some example that uses labels in a 2D view, because we have none I can find

[Wumpf]

@jleibs if things go well this will might be fixed as a collateral of

• Make all queries in all visualizers aware of blueprint DataResult #6435