tests: nvidia: place NIM service into namespace

Place the NIM service into our test namespace. We are still observing
various situations where for some reasons, the NIM service appears in
the default namespace in our CI.

Signed-off-by: Manuel Huber <manuelh@nvidia.com>

tests/integration/kubernetes/k8s-nvidia-nim-service.bats

@@ -185,7 +185,7 @@ setup() {
 @test "NIMService llama-3.2-1b-instruct serves /v1/models" {
     print_nimservice_namespace_resources "before apply"
     echo "NIMService test: Applying NIM YAML"
-    kubectl apply -f "${NIM_YAML}"
+    kubectl apply -n "${TEST_CLUSTER_NAMESPACE}" -f "${NIM_YAML}"
     echo "NIMService test: Waiting for deployment to exist (operator creates it from NIMService)"
     local wait_exist_timeout=30
     local elapsed=0