Python: [BREAKING] Python: move Azure AI embeddings to Foundry (#5056)

* renamed AzureAIINferenceEmbeddings and lazy load azure-cosmos and env var rename

* updated coverage

* fix readme

python/samples/02-agents/devui/workflow_with_agents/.env.example

@@ -2,7 +2,7 @@
 # This sample uses Azure CLI auth, so run `az login` before starting DevUI.
 
 AZURE_OPENAI_ENDPOINT=https://your-resource.openai.azure.com
-AZURE_OPENAI_RESPONSES_MODEL=gpt-4o
+AZURE_OPENAI_CHAT_MODEL=gpt-4o
 # Optional fallback env name also supported by the client:
 # AZURE_OPENAI_MODEL=gpt-4o
 # Optional if you need to override the default API version:

python/samples/02-agents/devui/workflow_with_agents/workflow.py

@@ -65,7 +65,7 @@ def is_approved(message: Any) -> bool:
 
 # Create Azure OpenAI Responses chat client
 client = OpenAIChatClient(
-    model=os.environ.get("AZURE_OPENAI_RESPONSES_MODEL") or os.environ.get("AZURE_OPENAI_MODEL"),
+    model=os.environ.get("AZURE_OPENAI_CHAT_MODEL") or os.environ.get("AZURE_OPENAI_MODEL"),
     azure_endpoint=os.environ.get("AZURE_OPENAI_ENDPOINT"),
     api_version=os.environ.get("AZURE_OPENAI_API_VERSION"),
     credential=AzureCliCredential(),