Proxito: better handling of single-version projects with more than one version (#12864)
When a project changes its versioning scheme to support just one
version, we don't delete the other versions.
In the case of our default robots.txt, if one of the other versions was
marked as hidden, the path would resolve to /, which matches the default
version, which may not be hidden.
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Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stsewd <4975310+stsewd@users.noreply.github.com>