find: add --hashes shortcut for piping to other commands (#38663)

People frequently ask us how to pipe `spack find` output to other commands, and we tell
them to do things like this:

```console
$ spack find --format "/{hash}" | spack uninstall -ay
```

Sometimes users don't know about hash references and come up with potentially ambiguous
formulations like this:

```console
spack find --format {name}@{version}%{compiler} | spack uninstall -ay
```

Since this is a common enough thing to want to do, and to make it more obvious how, this
PR adds a `-H` / `--hashes` as a shortcut, so you can now just do:

```console
spack find -H | spack uninstall -ay
```

share/spack/spack-completion.bash

@@ -1075,7 +1075,7 @@ _spack_fetch() {
 _spack_find() {
     if $list_options
     then
-        SPACK_COMPREPLY="-h --help --format --json -d --deps -p --paths --groups --no-groups -l --long -L --very-long -t --tag -c --show-concretized -f --show-flags --show-full-compiler -x --explicit -X --implicit -u --unknown -m --missing -v --variants --loaded -M --only-missing --deprecated --only-deprecated -N --namespace --start-date --end-date"
+        SPACK_COMPREPLY="-h --help --format -H --hashes --json -d --deps -p --paths --groups --no-groups -l --long -L --very-long -t --tag -c --show-concretized -f --show-flags --show-full-compiler -x --explicit -X --implicit -u --unknown -m --missing -v --variants --loaded -M --only-missing --deprecated --only-deprecated -N --namespace --start-date --end-date"
     else
         _installed_packages
     fi