chore: only start runtime process once on Windows

pkg/plugin/connector.py

@@ -129,6 +129,7 @@ class PluginRuntimeConnector:
             # We have to launch runtime via cmd but communicate via ws.
             self.ap.logger.info('(windows) use cmd to launch plugin runtime and communicate via ws')
             
+            if self.runtime_subprocess_on_windows is None:  # only launch once
                 python_path = sys.executable
                 env = os.environ.copy()
                 self.runtime_subprocess_on_windows = await asyncio.create_subprocess_exec(