Update tspconfig.yaml to include namespace for Azure AI Content Understanding for Python (#36548)

Author: yungshinlintw

specification/ai/ContentUnderstanding/tspconfig.yaml

@@ -28,6 +28,7 @@ options:
     package-pprint-name: "Azure AI Content Understanding"
     package-dir: "azure-ai-contentunderstanding"
     package-name: "{package-dir}"
+    namespace: "azure.ai.contentunderstanding"
     package-version: 1.0.0
     flavor: azure
     generate-test: true