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Cargo's testsuite uses a considerable amount of disk space. On windows-gnu, the target directory can get over 12GB, and there is only 13GB free. We're starting to run out of disk space, so this is a stop-gap that clears out the test data before running the smoke test which uses a fair bit of space itself.
We will probably need to think about addressing #9701 somehow, otherwise we will start running out of space as we add more tests. See the linked issues in #9701 (comment) for additional context.