Python: Add type annotations for AgentRunEvent and AgentRunUpdateEvent data attributes (#2589)

* Add type annotations for AgentRunEvent and AgentRunUpdateEvent data attributes

* Fix unnecessary cast after typing improvement

* Mcp pkg update introduced type change. Fix it.

* update opentelemetry deps to 1.39.0 and use LogRecordExporter for type compatibility

python/packages/core/tests/workflow/test_agent_run_event_typing.py

@@ -0,0 +1,43 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+"""Tests for AgentRunEvent and AgentRunUpdateEvent type annotations."""
+
+from agent_framework import AgentRunResponse, AgentRunResponseUpdate, ChatMessage, Role
+from agent_framework._workflows._events import AgentRunEvent, AgentRunUpdateEvent
+
+
+def test_agent_run_event_data_type() -> None:
+    """Verify AgentRunEvent.data is typed as AgentRunResponse | None."""
+    response = AgentRunResponse(messages=[ChatMessage(role=Role.ASSISTANT, text="Hello")])
+    event = AgentRunEvent(executor_id="test", data=response)
+
+    # This assignment should pass type checking without a cast
+    data: AgentRunResponse | None = event.data
+    assert data is not None
+    assert data.text == "Hello"
+
+
+def test_agent_run_event_data_none() -> None:
+    """Verify AgentRunEvent.data can be None."""
+    event = AgentRunEvent(executor_id="test")
+
+    data: AgentRunResponse | None = event.data
+    assert data is None
+
+
+def test_agent_run_update_event_data_type() -> None:
+    """Verify AgentRunUpdateEvent.data is typed as AgentRunResponseUpdate | None."""
+    update = AgentRunResponseUpdate()
+    event = AgentRunUpdateEvent(executor_id="test", data=update)
+
+    # This assignment should pass type checking without a cast
+    data: AgentRunResponseUpdate | None = event.data
+    assert data is not None
+
+
+def test_agent_run_update_event_data_none() -> None:
+    """Verify AgentRunUpdateEvent.data can be None."""
+    event = AgentRunUpdateEvent(executor_id="test")
+
+    data: AgentRunResponseUpdate | None = event.data
+    assert data is None