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tags: show how hg behaves if a tags cache entry is truncated

Description

tags: show how hg behaves if a tags cache entry is truncated

I'm seeing an error of this form in production on the order of once a
month. I'm not sure how it happens, but I suspect interrupting a pull
might result in half written cache entries.

Differential Revision: https://phab.mercurial-scm.org/D8094