Add missing tests - Githubissues

There's a package but no test for:

spack info cdo
spack info eccodes
spack info eckit
spack info fckit
spack info icon-ham
spack info infero
spack info libcdi-pio
spack info libfyaml
spack info libxml2
spack info nvidia-blas
spack info nvidia-lapack
spack info py-numpy
spack info py-poetry-core
spack info py-pytest
spack info py-setuptools
spack info py-typing-extensions (but there's a test for py-typing, even though that's not our package 🤷)
spack info scales-ppm
spack info yac
spack info yaxt
spack spec cdo
spack spec eccodes
spack spec icon-ham
spack spec libcdi-pio
spack spec libfyaml
spack spec libxml2
spack spec nvidia-blas
spack spec nvidia-lapack
spack spec py-numpy
spack spec py-poetry-core
spack spec py-pytest
spack spec py-setuptools
spack spec py-typing-extensions (but there's a test for py-typing, even though that's not our package 🤷)
spack spec scales-ppm
spack spec yac
spack spec yaxt
system test of ....

C2SM / spack-c2sm