MeshTrafficPermission doesn't work for ExternalServices that have different name and service

[lobkovilya]

What happened?

Root cause:

We're using es.Meta.GetName() instead of kuma.io/service tag:

kuma/pkg/plugins/policies/meshtrafficpermission/plugin/v1alpha1/plugin.go

Lines 100 to 106 in 4715080

	for _, es := range resource.ExternalServices {
	meshName := resource.Mesh.GetMeta().GetName()
	esName := es.Meta.GetName()
	policies, ok := resource.Dynamic[esName]
	if !ok {
	continue
	}

Also, e2e test should use ExternalService with a different name and service:

kuma/test/e2e_env/multizone/meshtrafficpermission/meshtrafficpermission.go

Lines 20 to 28 in 4715080

	type: ExternalService
	mesh: "%s"
	name: external-service
	tags:
	kuma.io/service: external-service
	kuma.io/protocol: http
	networking:
	address: "%s"
	`, mesh, net.JoinHostPort(ip, "80")))