PR #40929 reverted the argument parsing to make `spack --verbose
install` work again. It looks like `--verbose` is the only instance
where this kind of argument inheritance is used since all other commands
override arguments with the same name instead. For instance, `spack
--bootstrap clean` does not invoke `spack clean --bootstrap`.
Therefore, fix multi-line aliases again by parsing the resolved
arguments and instead explicitly pass down `args.verbose` to commands.
7db386a018