kdump.sysconfig*: add ignition.firstboot to KDUMP_COMMANDLINE_REMOVE
    
    Resolves: bz2090533
    Upstream: Fedora
    Conflict: None
    
    commit 218d9917c03f25bc9872f076491c587815d16efb
    Author: Dusty Mabe <dusty@dustymabe.com>
    Date:   Mon May 16 14:04:12 2022 -0400
    
        kdump.sysconfig*: add ignition.firstboot to KDUMP_COMMANDLINE_REMOVE
    
        For CoreOS based systems we use Ignition for provisioning machines
        in the initramfs on first boot. We trigger Ignition right now by
        the presence of `ignition.firstboot` in the kernel command line. The
        kernel argument is only present on first boot so after a reboot it
        no longer is in the kernel command line.
    
        If a kernel crash happens before the first reboot of a machine we
        want the `ignition.firstboot` kernel argument to be removed and not
        passed on to the crash kernel.
    
    Signed-off-by: Lichen Liu <lichliu@redhat.com>