test/helpers: add deadlock detection for Cilium pods
test/helpers: add deadlock detection for Cilium pods

Add function that, if a test fails, checks if a deadlock has occurred via output
in the Cilium logs.

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

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