remove Oracle Linux 8 from the TK tests in CI
remove Oracle Linux 8 from the TK tests in CI

The official oraclelinux:8 image has been nerfed to a point where it
doesn't act enough like a VM to use in Dokken. Maybe that's fixible
later. Until then, CentOS will cover our testing there.

Signed-off-by: Robb Kidd <a629c362624370ec351e141df0bd1d27621ff790@thekidds.org>

jaymzh/chef,tas50/chef-1,chef/chef,MsysTechnologiesllc/chef,chef/chef,MsysTechnologiesllc/chef,higanworks/chef,nvwls/chef,gene1wood/chef,mwrock/chef,jaymzh/chef,higanworks/chef,higanworks/chef,gene1wood/chef,mattray/chef,mwrock/chef,MsysTechnologiesllc/chef,nvwls/chef,higanworks/chef,mattray/chef,mwrock/chef,mwrock/chef,mattray/chef,mattray/chef,nvwls/chef,jaymzh/chef,nvwls/chef,gene1wood/chef,nvwls/chef,tas50/chef-1,mattray/chef,higanworks/chef,gene1wood/chef,chef/chef,nvwls/chef,MsysTechnologiesllc/chef,tas50/chef-1,chef/chef,jaymzh/chef,tas50/chef-1