tests: `coverage combine` run only if tests succeeded (#2712)
tests: `coverage combine` run only if tests succeeded (#2712)


LLNL/spack,LLNL/spack,mfherbst/spack,EmreAtes/spack,iulian787/spack,skosukhin/spack,lgarren/spack,TheTimmy/spack,tmerrick1/spack,mfherbst/spack,skosukhin/spack,matthiasdiener/spack,matthiasdiener/spack,TheTimmy/spack,tmerrick1/spack,krafczyk/spack,EmreAtes/spack,krafczyk/spack,lgarren/spack,matthiasdiener/spack,mfherbst/spack,mfherbst/spack,EmreAtes/spack,matthiasdiener/spack,EmreAtes/spack,skosukhin/spack,TheTimmy/spack,TheTimmy/spack,tmerrick1/spack,mfherbst/spack,matthiasdiener/spack,TheTimmy/spack,iulian787/spack,lgarren/spack,EmreAtes/spack,iulian787/spack,skosukhin/spack,lgarren/spack,skosukhin/spack,LLNL/spack,LLNL/spack,tmerrick1/spack,iulian787/spack,tmerrick1/spack,lgarren/spack,krafczyk/spack,krafczyk/spack,iulian787/spack,LLNL/spack,krafczyk/spack