Enable the large datasets only for non-ultra debug to avoid CI timeout
Enable the large datasets only for non-ultra debug to avoid CI timeout

Really we should run the ultra-debug mode only on the C tests, but
this should be a good-enough stopgap solution. The end-to-end tests
that don't actually test things should be moved to cactusBenchmarks.

benedictpaten/cactus,benedictpaten/cactus,benedictpaten/cactus,benedictpaten/cactus,benedictpaten/cactus