In SERVER-63486, we added a generic hook that contains a background thread. The background thread continuous runs some action that can be overridden.

We should convert the SimulateCrashes hook to use the new infrastructure. I started doing this work, but I ran into failures that seem to also be showing up on waterfall. It seems SimulateCrashes swallows those errors, so they weren't noticed until now. BGHook will raise any errors that it runs into, which would cause the hook to fail on waterfall. This ticket should resolve those errors and update the hook to use the new infrastructure.