Fix background (again) for ipywidgets #11062
Merged
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For #11060
I had removed this by accident on my refactor for how widgets were rendered.
Also fixed a problem with the functional tests running with real jupyter (caused by the IInterpreterSecurity stuff). @karrtikr you fixed the functional tests when running without jupyter, but it's a little bit more tricky than that. Some of our services a registered differently when using real jupyter (Nightly Flake tests)