Test: Add prometheus deployment on Kubernetes test
Test: Add prometheus deployment on Kubernetes test

Installing prometheus on test to scrape Cilium metrics to detect if any
problem on Cilium

Related-to: #4490
Related-to: `dc7a613318a8514dee4f0cce90eefa0664ab5a59`

Signed-off-by: Eloy Coto <2a8acc28452926ceac4d9db555411743254cf5f9@gmail.com>

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