chore: upgrade to jest 27

[benmccann]

Summary

Jest 26.6.2 is 5 years old and does not support AbortController, which is blocking a switch to tinyglobby

Test Plan

See if existing tests pass

Checklist

• [x] Documentation is up to date.
• [x] Follows commit message convention described in CONTRIBUTING.md.
• [x] For functional changes, my test plan has linked these CLI changes into a local react-native checkout (instructions).