Test: Fix some By messages on kubectl.
Test: Fix some By messages on kubectl.

The By functions call from Kubectl are from ginkgo instead of ginkgoext.
That info is displayed, but not saved on test-output that makes things
a bit harder to debug.

Also, deleted the ginkgo.Fail and use ginkgoext.Fail

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

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