Release OpAddEntry.data when entry is copied and discarded (#10773)

Fixes #10738

There's a ByteBuf leak that happens in ledger rollover. The repro case in #10738 reproduces some Netty ByteBuf leaks that are detected by the Netty Leak detector.

Release `OpAddEntry.data` when the original entry is copied and discarded

This PR was split out of PR #10755 which was closed without merging.

managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java

@@ -36,6 +36,7 @@
 import io.netty.buffer.Unpooled;
 import io.netty.util.Recycler;
 import io.netty.util.Recycler.Handle;
+import io.netty.util.ReferenceCountUtil;
 import java.time.Clock;
 import java.util.Collections;
 import java.util.HashMap;
@@ -1399,6 +1400,8 @@ public synchronized void updateLedgersIdsComplete(Stat stat) {
                 if (existsOp.ledger != null) {
                     existsOp.close();
                     existsOp = OpAddEntry.create(existsOp.ml, existsOp.data, existsOp.callback, existsOp.ctx);
+                    // release the extra retain
+                    ReferenceCountUtil.release(existsOp.data);
                 }
                 existsOp.setLedger(currentLedger);
                 pendingAddEntries.add(existsOp);