operator: make: Add install target
operator: make: Add install target

Add `install` make target which installs cilium-operator binaries.

Fixes: #12184
Signed-off-by: Michal Rostecki <82ebf970c69340aebb770c3853be5fd96a3eb584@opensuse.org>

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