bpf: check for cilium-map-migrate instead of cilium CLI client in init.sh
bpf: check for cilium-map-migrate instead of cilium CLI client in init.sh

The `cilium` CLI is no longer used by init.sh since commit 1c18d1da0526
("cache: Support looking up reserved identities"). Instead check for
cilium-map-migrate which is used in several places.

Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>

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