Give each robustness test a fixture of its own

repos/rob took commits, refs, tags, a repack and a moved HEAD from test
after test, so what a test checked hung on the ones before it. A test
that changes a repository, or needs one in a shape of its own, now
builds it, and rob is only read. The tests that leaned on a config or a
scanned repository an earlier test left build their own too.

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