fix: an unstable test

[liuxingbaoyu]

Summary

https://github.com/facebook/jest/runs/7796198469?check_suite_focus=true
The temp folder used by the tests was not deleted and sometimes failed due to conflicts.
Add afterEach to remove it.

Test plan

Test passed normally

[facebook-github-bot]

Hi @liuxingbaoyu!

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[SimenB]

great catch, thanks! once CLA is signed I can merge 🙂

[liuxingbaoyu]

Even though I signed the CLA a minute after opening the PR, it looks like it's slow to update, let's wait.😃

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[SimenB]

Thanks! Yeah, the bot is a bit slow...

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