[CI][Bugfix]: return McpCall for built-in MCP tools in non-streaming mode (#32762)

Signed-off-by: Andreas Karatzas <akaratza@amd.com>

tests/entrypoints/openai/responses/test_mcp_tools.py

@@ -160,6 +160,7 @@ class TestMCPEnabled:
                 "No developer messages should be present with valid mcp tool"
             )
 
+    @pytest.mark.flaky(reruns=3)
     @pytest.mark.asyncio
     @pytest.mark.parametrize("model_name", [MODEL_NAME])
     async def test_mcp_tool_with_allowed_tools_star(