re-enable kdump.crash test on s390x

[dustymabe]

commit 229724d97f931e3494a8306a2f513476f2743e2e
Author: Dusty Mabe <dusty@dustymabe.com>
Date:   Thu Jul 21 15:01:01 2022 -0400

    denylist: use more appropriate link for ppc64le kdump.crash denial
    
    The other issue was closed and this one looks more appropriate.

commit 32603e61b8483bd1e0e0f840d3556b985b707d23
Author: Dusty Mabe <dusty@dustymabe.com>
Date:   Thu Jul 21 14:58:44 2022 -0400

    tests: enable kdump.crash test for rawhide on s390x
    
    The fix has landed in rawhide [1]. Let's re-enable the test for
    rawhide and set a snooze on the other branches to remind ourselves
    to followup for the other branches.
    
    [1] https://github.com/coreos/fedora-coreos-config/issues/1500#issuecomment-1191799541

commit a65c241feec507fe72b995f299156cfe311bba0e
Author: Dusty Mabe <dusty@dustymabe.com>
Date:   Thu Jul 21 14:15:03 2022 -0400

    manifests/user-experience: explicitly add file RPM
    
    This is pulled in by GRUB on platforms that use GRUB, but we want
    it even on platforms that don't use GRUB.
    
    I noticed this when trying to run the ext.config.kdump.crash test
    on s390x and it failed because `/usr/bin/file` didn't exist.