CI should fail when individual tests fail

[RobertPincus]

Small changes to scripts and in-test tolerances.

[alexeedm]

Looks good to me.
Tolerance might be a bit tight, but I don't know a robust way to set it. We may need to check it again when NVHPC 24.1 is released.

[skosukhin]

This now works with NVHPC versions 22.5, 23.7 and 23.9 (-g -O2 -Mrecursive -Mallocatable=03 -Mstack_arrays -Minfo=accel,inline -acc=gpu,verystrict -gpu=cc80) and Cray 16.0.1 (-hacc -hadd_paren -Ktrap=divz,ovf,inv -hflex_mp=intolerant -hfp1 -g).