fix(harness): the legacy MIG is named selfheal-legacy-mig (mig.recreate_instance / mig.resize targets)

vm/harness/apply.sh

@@ -39,7 +39,7 @@ HARNESS_TAG="$(cat image.tag)"
   printf 'AWS_REGION=ap-northeast-1\n'
   printf 'GCP_PROJECT=%s\n' "$PROJECT"
   printf 'GCP_REGION=asia-northeast1\n'
-  printf 'LEGACY_MIG=selfheal-legacy\n'
+  printf 'LEGACY_MIG=selfheal-legacy-mig\n'
   printf 'K8S_API=https://10.10.0.10:6443\n'
   printf 'MIMIR_URL=http://10.20.0.10:9009/prometheus\n'
   printf 'AI_DIAGNOSE_URL=http://10.20.0.12:8080/diagnose\n'