server: add dummy diarization and fixes instanciation

server/reflector/pipelines/runner.py

@@ -55,11 +55,8 @@ class PipelineRunner(BaseModel):
         """
         Start the pipeline synchronously (for non-asyncio apps)
         """
-        loop = asyncio.get_event_loop()
-        if not loop:
-            loop = asyncio.new_event_loop()
-            asyncio.set_event_loop(loop)
-        loop.run_until_complete(self.run())
+        coro = self.run()
+        asyncio.run(coro)
 
     def push(self, data):
         """