Remove MetricsBatch from EncryptedPacketPayload (#1176)

* Remove MetricsBatch from EncryptedPacketPayload

* generated protobuf

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Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: lukasIO

livekit/livekit_models.pb.go

@@ -314,14 +314,15 @@ message EncryptedPacket {
 message EncryptedPacketPayload {
   oneof value {
     UserPacket user = 1;
-    MetricsBatch metrics = 2;
     ChatMessage chat_message = 3;
     RpcRequest rpc_request = 4;
     RpcAck rpc_ack = 5;
     RpcResponse rpc_response = 6;
     DataStream.Header stream_header = 7;
     DataStream.Chunk stream_chunk = 8;
     DataStream.Trailer stream_trailer = 9;
+
+    // NEXT_ID: 10
   }
 }