Python: [BREAKING] Remove deprecated Python OpenAI/Azure AI surfaces (#4990)

* [BREAKING] Remove deprecated Python OpenAI/Azure AI surfaces

Also clean up follow-on docs, environment guidance, package metadata, and lab test stability.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix deleted semantic-kernel sample links

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR review feedback

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* improve foundry language

* Fix A2A Foundry sample regression

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/packages/azurefunctions/agent_framework_azurefunctions/_app.py

@@ -124,16 +124,17 @@ class AgentFunctionApp(DFAppBase):
 
     .. code-block:: python
 
-        from agent_framework.azure import AgentFunctionApp, AzureOpenAIChatClient
+        from agent_framework.azure import AgentFunctionApp
+        from agent_framework.openai import OpenAIChatCompletionClient
 
         # Create agents with unique names
-        weather_agent = AzureOpenAIChatClient(...).as_agent(
+        weather_agent = OpenAIChatCompletionClient(...).as_agent(
             name="WeatherAgent",
             instructions="You are a helpful weather agent.",
             tools=[get_weather],
         )
 
-        math_agent = AzureOpenAIChatClient(...).as_agent(
+        math_agent = OpenAIChatCompletionClient(...).as_agent(
             name="MathAgent",
             instructions="You are a helpful math assistant.",
             tools=[calculate],

python/packages/azurefunctions/tests/integration_tests/.env.example

@@ -1,6 +1,6 @@
 # Azure OpenAI Configuration
 AZURE_OPENAI_ENDPOINT=https://your-resource.openai.azure.com/
-AZURE_OPENAI_CHAT_DEPLOYMENT_NAME=your-deployment-name
+AZURE_OPENAI_DEPLOYMENT_NAME=your-deployment-name
 FUNCTIONS_WORKER_RUNTIME=python
 
 # Azure Functions Configuration