Request every snapshot name back to its ref

The names on the links were checked but never requested back, and the
tests shared one repository whose refs each test added to, so a run of
a subset broke them. On a case-insensitive filesystem a loose V1.0 also
answered lookups for v1.0, so the case tests checked different tags
from one filesystem to another. The slash ref sat at master's tip,
where the commit compare could not tell it from the default branch.

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