Test examples visualisation in CI

[EwoutH]

If we can test the visualisation in CI that would be quite great. Especially the new Solara based one.

[EwoutH]

@rht could we do this by detecting all the app.py files and running those in some way?

[rht]

Agreed, that should do.

[EwoutH]

Since you wrote the original test_examples.py tests and workflow, would you like to give it a shot?

[EwoutH]

Since everything is already breaking, #154 is far from done, and a new visualization is incoming (mesa/mesa#2263) which will break things again, I pinned this issue to mark it as a priority.