Consume InterimTranscriptionFrame and TranslationFrame in LLMUserAggregator

These frames were falling through to the else branch and being pushed
downstream, unlike TranscriptionFrame which is explicitly consumed.
This aligns with how the assistant aggregator already filters them.

src/pipecat/processors/aggregators/llm_response_universal.py

@@ -461,6 +461,10 @@ class LLMUserAggregator(LLMContextAggregator):
             await self.push_frame(frame, direction)
         elif isinstance(frame, TranscriptionFrame):
             await self._handle_transcription(frame)
+        elif isinstance(frame, (InterimTranscriptionFrame, TranslationFrame)):
+            # Interim transcriptions and translations are consumed here
+            # and not pushed downstream, same as final TranscriptionFrame.
+            pass
         elif isinstance(frame, LLMRunFrame):
             await self._handle_llm_run(frame)
         elif isinstance(frame, LLMMessagesAppendFrame):