Python: Fix cancelled typo (#9389)

### Motivation and Context

An agent terminal status was misspelled: canceled -> cancelled

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### Description

Fixing the spelling.

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### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [X] The code builds clean without any errors or warnings
- [X] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [X] All unit tests pass, and I have added new tests where possible
- [X] I didn't break anyone 😄

python/semantic_kernel/agents/open_ai/open_ai_assistant_base.py

@@ -93,7 +93,7 @@ class OpenAIAssistantBase(Agent):
 
     allowed_message_roles: ClassVar[list[str]] = [AuthorRole.USER, AuthorRole.ASSISTANT]
     polling_status: ClassVar[list[str]] = ["queued", "in_progress", "cancelling"]
-    error_message_states: ClassVar[list[str]] = ["failed", "canceled", "expired", "incomplete"]
+    error_message_states: ClassVar[list[str]] = ["failed", "cancelled", "expired", "incomplete"]
 
     channel_type: ClassVar[type[AgentChannel]] = OpenAIAssistantChannel
 

python/tests/unit/agents/test_open_ai_assistant_base.py

@@ -306,6 +306,32 @@ def mock_run_incomplete():
     )
 
 
+@pytest.fixture
+def mock_run_cancelled():
+    return Run(
+        id="run_id",
+        status="cancelled",
+        assistant_id="assistant_id",
+        created_at=123456789,
+        instructions="instructions",
+        model="model",
+        object="thread.run",
+        thread_id="thread_id",
+        tools=[],
+        required_action=RequiredAction(
+            type="submit_tool_outputs",
+            submit_tool_outputs=RequiredActionSubmitToolOutputs(
+                tool_calls=[
+                    RequiredActionFunctionToolCall(
+                        id="tool_call_id", type="function", function=Function(arguments="{}", name="function_name")
+                    )
+                ]
+            ),
+        ),
+        parallel_tool_calls=True,
+    )
+
+
 @pytest.fixture
 def mock_function_call_content():
     return FunctionCallContent(id="function_call_id", name="function_name", arguments={})
@@ -1568,7 +1594,7 @@ async def test_poll_run_status(
 
 
 @pytest.mark.asyncio
-async def test_poll_run_status_incomplete_throws(
+async def test_poll_run_status_incomplete(
     azure_openai_assistant_agent, mock_run_required_action, mock_run_incomplete, openai_unit_test_env
 ):
     with patch.object(azure_openai_assistant_agent, "client", spec=AsyncAzureOpenAI) as mock_client:
@@ -1584,6 +1610,23 @@ async def test_poll_run_status_incomplete_throws(
         assert run.status in azure_openai_assistant_agent.error_message_states
 
 
+@pytest.mark.asyncio
+async def test_poll_run_status_cancelled(
+    azure_openai_assistant_agent, mock_run_required_action, mock_run_cancelled, openai_unit_test_env
+):
+    with patch.object(azure_openai_assistant_agent, "client", spec=AsyncAzureOpenAI) as mock_client:
+        mock_client.beta = MagicMock()
+        mock_client.beta.assistants = MagicMock()
+
+        mock_client.beta.threads.runs.retrieve = AsyncMock(return_value=mock_run_cancelled)
+
+        run = await azure_openai_assistant_agent._poll_run_status(
+            run=mock_run_required_action, thread_id="test_thread_id"
+        )
+
+        assert run.status in azure_openai_assistant_agent.error_message_states
+
+
 @pytest.mark.asyncio
 async def test_poll_run_status_exception_polls_again(
     azure_openai_assistant_agent, mock_run_required_action, mock_run_completed, openai_unit_test_env