test(storage-consumer): Fix formatting in Iceberg test sink

- Align method signatures for better readability
- No functional changes, only whitespace adjustments

Signed-off-by: tenfyzhong <tenfy@tenfy.cn>

Author: tenfyzhong

cmd/storage-consumer/iceberg_test.go

@@ -40,10 +40,10 @@ func (s *blockingFlushSink) WriteBlockEvent(commonEvent.BlockEvent) error { retu
 func (s *blockingFlushSink) AddCheckpointTs(uint64)                       {}
 func (s *blockingFlushSink) SetTableSchemaStore(*commonEvent.TableSchemaStore) {
 }
-func (s *blockingFlushSink) Close(bool)              {}
+func (s *blockingFlushSink) Close(bool)                {}
 func (s *blockingFlushSink) Run(context.Context) error { return nil }
-func (s *blockingFlushSink) BatchCount() int         { return 0 }
-func (s *blockingFlushSink) BatchBytes() int         { return 0 }
+func (s *blockingFlushSink) BatchCount() int           { return 0 }
+func (s *blockingFlushSink) BatchBytes() int           { return 0 }
 
 func (s *blockingFlushSink) AddDMLEvent(event *commonEvent.DMLEvent) {
 	s.added <- event.CommitTs