Check submodule links by revision, path and url

Every request viewed HEAD and every gitlink sat at the top level, so a
link read from the wrong revision's .gitmodules, or looked up by the
shown name rather than the full path, passed. The other url schemes,
the whole-component rule, the other forges, the templates that take
precedence and the submodule page had no test, and the gitlinks
pointed at the parent's own commit rather than one of subtarget's.

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