General overhaul; build packages and container images by application

[AlexanderRichert-NOAA]

This PR overhauls these workflows:

• It reduces and refines the matrix configurations in the workflows
• It defines a separate manifest file for each application, each of which is processed in separate workflows for selected (non-excluded) matrix configs and creates a container image
• It adds various validation steps, and uses Spack v1
• Debug output is greatly improved, such as by grouping output from each spack call.
• Container generation looks very different, now copying in spack.yaml and spack.lock, alongside using spack install --only-concrete so that packages can only be installed from the build cache, with no new concretization during container image creation.
• The custom repo now contains recipes for ip and bufr test files, used in both nceplibs templates