[tests] Isolate cleaner's cache accross tests

[pmoravec]

Similarly to --no-update and overriding default_mapping file, we need to isolate cleaner_cache per relevent test cases. Otherwise, items in the cach (like 'tmp') can pollute further tests.

Closes: #4442

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo dnf install -y 'dnf*-command(copr)'
• dnf copr enable packit/sosreport-sos-4442
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.