Pull Request Checklist

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• Have you referenced any issues you're fixing using commit message keywords?
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• Have you added tests for any changed functionality?

Helpful things

Fixes

Fixes #13013

Purpose

Do not try to delete the temporary folder during shutdown if it was never created in the 1st place. Because when trying to delete, it actually tries to create the folder if it was not already created. This is useless and can cause errors with read-only filesystems.

Background Context

I used a simple mutable var as I believe this is enough in this context: the var is private, in a singleton, only set during a lazy val initialization.
However, if you believe we should use an AtomicBoolean, just say it :)

Note that I didn't add test, not sure if this is worth it and I'm not sure how to approach writing such a test.

References

N/A