Temporary directories containing tor browser bundle are not correctly removed

On tb-tester-01 we have an issue where some temporary directories containing the tor browser bundles are not removed.

Some of the files are:

/tmp/tmp.aGgHL5Eljc:
sha256sums-unsigned-build.txt  sha256sums-unsigned-build.txt.asc  tor-browser-linux64-tbb-nightly.2021.09.05_en-US.tar.xz

/tmp/tmp.hTmfYbJ98K:
sha256sums-unsigned-build.txt  sha256sums-unsigned-build.txt.asc  tor-browser-linux64-tbb-nightly.2021.09.03_en-US.tar.xz

/tmp/tmp.iniZHzrkht:
sha256sums-unsigned-build.txt  sha256sums-unsigned-build.txt.asc  tor-browser-linux64-tbb-nightly.2021.07.22_en-US.tar.xz

/tmp/tmp.lrukLm8sy9:
sha256sums-unsigned-build.txt  sha256sums-unsigned-build.txt.asc  tor-browser-linux64-tbb-nightly.2021.07.28_en-US.tar.xz

/tmp/tmp.ouPhDtYIVJ:
sha256sums-unsigned-build.txt  sha256sums-unsigned-build.txt.asc  tor-browser-linux64-tbb-nightly.2021.09.01_en-US.tar.xz

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