Fix async teardown issues

[bjnewman]

🐛 Bug report

Current Behavior

After upgrading from node 14 to 16, multiple projects are encountering CI failures where Jest unit tests hang and the builds timeout after an hour.

Expected behavior

Jest tests should exit appropriately, erroring/failing tests where necessary

Reproducible example

Internal reproduction available on request.

Suggested solution(s)

We could add a process.on('unhandledRejection') handler or otherwise force the node process to exit gracefully when jest hangs

Additional context

Node 14 was recently EOL so we have a lot of teams upgrading.

[gregmartDOTin]

This was determined to be an issue with jest performance in node 16+. Please see #683 for more information.