99squash: Don't clean up squahfs on isolate
    
    The only time we need to cleanup squahfs manually is on switch root, to
    release resource and memory. We've covered that by setting
    "Conflicts=initrd-switch-root.target" for squash cleanup service.
    On shutdown systemd will take care of squahfs mounts. But for other
    isolate, files in initramfs are most likely still required, so don't
    clean up squahfs. For example, kdump's emergency handler will isolate
    into its own target, if squahfs is cleaned up it will fail.
    
    Signed-off-by: Kairui Song <kasong@redhat.com>
    
    Cherry-picked from: b9af0fcd
    Resolves: #1641423
    
    patch_name: 0005.patch
    present_in_specfile: true
    location_in_specfile: 5
    squash_commits: true