Remove the unused `health-monitor.sh`.
Remove the unused `health-monitor.sh`.

Signed-off-by: Lantao Liu <e12a959b3f33bba53f1a03da59760f37bd7265d7@google.com>

vdemeester/containerd,thaJeztah/containerd,mikebrow/containerd,mikebrow/containerd,thaJeztah/containerd,containerd/containerd,dmcgowan/containerd,estesp/containerd,dmcgowan/containerd,estesp/containerd,containerd/containerd,vdemeester/containerd