Investigate first-frame heuristics for our default examples

[emilk]

cargo rerun reset, then open objectron over a slow internet connection, and you sometimes get this:

As 3D spaceview with a 2D image in it.

Most of the time though I "just" end up with this:

A weird extra space-view, taking up most of the screen.

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It would be nice with a way to test all our examples on a slow connection, to find weird first-frame heuristic issues.

[Wumpf]

I believe the concrete issue is fixed by

• Refactor the 2D heuristic again #5166

Since the 2D heuristic then very rarely suggests /

Overall related to:

• Heuristic shouldn't add overall general space-views if the existing views cover it in aggregate #5167

I think there's an even higher level issue of the heuristic right now not being able to touch existing views, all we do is additive and this causes a lot of issue.