test: remove unused helper function, `WaitEndpointRegenerated`
test: remove unused helper function, `WaitEndpointRegenerated`

Signed-off by: Ian Vernon <ian@cilium.io>

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