install: add --use-cache back so that existing tooling does not break (#9797)
install: add --use-cache back so that existing tooling does not break (#9797)

- default is still to use the cache, but we've added back the
  `--use-cache` argument so that scripts that used it are still correct.

- `--no-cache` is stil present and is mutually exclusive with `--use-cache`
LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack