[core] Support remove-record-on-delete for aggregation merge engine

Author: 李鹏程

paimon-core/src/main/java/org/apache/paimon/mergetree/compact/aggregate/AggregateMergeFunction.java

@@ -81,16 +81,15 @@ public void reset() {
 
     @Override
     public void add(KeyValue kv) {
+        latestKv = kv;
         boolean isRetract =
                 kv.valueKind() != RowKind.INSERT && kv.valueKind() != RowKind.UPDATE_AFTER;
 
-        if (removeRecordOnDelete && isRetract) {
-            currentDeleteRow = true;
+        currentDeleteRow = removeRecordOnDelete && isRetract;
+        if (currentDeleteRow) {
             return;
         }
 
-        latestKv = kv;
-
         for (int i = 0; i < getters.length; i++) {
             FieldAggregator fieldAggregator = aggregators[i];
             Object accumulator = getters[i].getFieldOrNull(row);