lbann
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Allow Catch2 version 3 to be used in addition to version 2.
This will hold us over for a transition period. I'd like to get to Catch2 v3 in general, though, as it's better factored. (I can do that now, but I know @bvanessen just put work in to make sure we only use Catch2 v2...)
CI shows a build problem that I thought I had fixed. I might have an uncommitted fix lying around. I'll fix this and ask for a follow-up review when all's good with CI.