tests/kernel-replace: update to f38 kernel; drop cruft

[dustymabe]

Here we update to the kernel from F38 GA and also drop the rpm-ostree version check since all streams are past that. We also drop the kernel-modules-core check since that's no longer needed either.

[dustymabe]

@jmarrero we might be able to also revisit

fedora-coreos-config/tests/kola/rpm-ostree/kernel-replace

Lines 8 to 10 in 64f2dc3

	## # This test only runs on FCOS due to a problem with skopeo copy on
	## # RHCOS. See: https://github.com/containers/skopeo/issues/1846
	## distros: fcos

[jmarrero]

@jmarrero we might be able to also revisit

fedora-coreos-config/tests/kola/rpm-ostree/kernel-replace

Lines 8 to 10 in 64f2dc3

	## # This test only runs on FCOS due to a problem with skopeo copy on
	## # RHCOS. See: https://github.com/containers/skopeo/issues/1846
	## distros: fcos

cool, I will give it a try and see if looks good on RHCOS too and remove the restriction if it does.

[jmarrero]

@dustymabe started to look at it and it seems like we already have this covered via the rt-kernel test on RHCOS which is failing currently. I am taking: openshift/os#1383 which first part test the override replace.

[dustymabe]

@jmarrero thanks! maybe we should update the comment in this test to mention this is covered in RHCOS by the kernel-rt test