populate: follow branches and tags of git sources

A ref that consists of 4 to 40 hex digits is a commit, which populate
fetches only if the work tree lacks it, unless fetchAlways is set.  Any
other ref is a branch or tag, which populate fetches on every run,
resetting the work tree to the commit fetched.  Resetting to the name
itself resolves to a local branch, which fetching doesn't move.

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