health: Fix up IP removal from health prober
health: Fix up IP removal from health prober

The `prober.nodes` is actually a map of nodes sorted by peer IP as the
key, where the peer IP could be either the node's IP or the node's
health endpoint IP. Deletion from this should be done using each
individual node address, rather than only deleting the element that is
currently being iterated over.

Related: #9103

Signed-off-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@cilium.io>

cilium-team/cilium,tklauser/cilium,tklauser/cilium,tgraf/cilium,cilium-team/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium