[jupyter] Restored ipyvtklink and static PyVista rendering backend.

[ci] Run jupyter tests in regular (osmesa) container.

Rendering backend can be set via:

import pyvista as pv

pv.set_jupyter_backend('ipyvtklink') # default
pv.set_jupyter_backend('pythreejs')
pv.set_jupyter_backend('static')

1. Feature description was added to the changelog
2. Tests covering your feature were added?