Currently, we link all patchset-level comments to the comments tab,
but it doesn't make sense for robot comments since we don't show them
in the comments tab. Thus, patchset-level robot comments will be linked
to the findings tab.
There is an exception: Comments are grouped by file, and thus both human
and robot comments can be in the same group and have the same link.
For this case, links to the files of such potential groups were omitted.
Change-Id: Iaf795bc34483689497e7cf8b747faf2f68a244a3
781a7bade9