Update operator-test with manager label

Adding `control-plane: controller-manager` label to match [operator-restart e2e test](open-telemetry/opentelemetry-operator#3486)

.github/workflows/operator-test.yaml

@@ -58,7 +58,8 @@ jobs:
         run: |
           helm install --namespace=opentelemetry-operator-system --create-namespace my-opentelemetry-operator ./charts/opentelemetry-operator \
             --set 'manager.extraArgs[0]="--enable-go-instrumentation"' \
-            --set "manager.collectorImage.repository=otel/opentelemetry-collector-k8s"
+            --set "manager.collectorImage.repository=otel/opentelemetry-collector-k8s" \
+            --set "manager.podLabels.control-plane=controller-manager"
           kubectl wait --timeout=5m --for=condition=available deployment my-opentelemetry-operator -n opentelemetry-operator-system
 
       - name: Run e2e tests
@@ -111,6 +112,7 @@ jobs:
           helm install --namespace=opentelemetry-operator-system --create-namespace my-opentelemetry-operator ./charts/opentelemetry-operator \
             --set 'manager.extraArgs[0]="--enable-go-instrumentation"' \
             --set "manager.collectorImage.repository=otel/opentelemetry-collector-k8s" \
+            --set "manager.podLabels.control-plane=controller-manager" \
             --set "admissionWebhooks.certManager.enabled=false"
           kubectl wait --timeout=5m --for=condition=available deployment my-opentelemetry-operator -n opentelemetry-operator-system