Several fixes for compiler installation

Martin Langrequested to merge
intel-compiler into main
  • install fallback compiler first
  • install intel compiler using on toolchain gcc
  • search for intel oneapi compilers in correct directory (bin symlink does no longer exist)
  • remove modifications of compilers.yaml: the correct gcc is now picked via installing the intel compiler with the desired gcc, some of the other flags may still be needed for the compiler (we have to re-add those if we run into any problems)
  • fix detection of intel mpi package to determine octopus-dependencies metamodule path

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