Backport device health fixes to Nautilus

Hi, I would like to see https://github.com/ceph/ceph/pull/28848 backported to Nautilus, as I'm currently unable to use devicehealth on 14.2.7 due to the fact that smartctl exist code > 0 is not handled properly. I cherry-picked those commits on the nautilus branch, and they all apply cleanly, but when I try to follow https://github.com/ceph/ceph/blob/master/SubmittingPatches-backports.rst#cr…, I'm stuck because (as far as I can tell) the "master tracker issue" doesn't exist. What would be the best way forward in this case? Submit a PR without a backport tracker issue? Manually create the backport issue? Cheers, -- Ben