ci: automatically prune the broken-specs list (#24809)
ci: automatically prune the broken-specs list (#24809)

When a develop pipeline successfully finishes a `spack install`, check if
the spec that was just built is on the broken-specs list. If so, remove it.
LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack