TestSplitExec::test_context_process fails locally and in CI

[arthurzam]

This test fails in CI, but passes locally. The failure in CI looks weird from output (an exception isn't of type BaseException, but it looks like it does).

[ferringb]

Tracing that code, there's stuff it's doing that feels "poke the cpython guts and piss of the bear". My thought is to drop it out since the usage is AFAIK limited to snakeoil internals, but some of the internals aren't things we can drop. They have valid uses.

@radhermit any comment on this bit of code? I've not done a full walk through of it, but if you've any comments- in particular the dance you're doing there trying to shift things out of the parent and into the child (keeping those objects and side effects child side), I'd appreciate, minimally just out of interest for the war story.