d/t/upstream-*: ensure clean build by calling override_dh_auto_clean

Aquila Macedorequested to merge
aquila/curl:fixing-autopkgtest into debian/unstable

Add debian/rules override_dh_auto_clean at the beginning of each d/t/upstream-* autopkgtest to avoid build leftovers (for instance: https://salsa.debian.org/debian/curl/-/jobs/7490618#L4889) and ensure clean test runs

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