Start work on detecting leaked handles in tests

For now, just track models. Tests fail because we don't
yet clear the app contexts at the right time.

Co-Authored-By: Nathan Sobo <nathan@zed.dev>
7d53e37672Max Brunsfeld committed on 3/1/2022, 6:02:43 AMparentd1d324e
6 files changedLine totals unavailable