Revert "[debugger] avoid using writeUTF, it does not work for long strings"

We have to be compatible with the previous format
This reverts commit 9242ed91f50c3f1ce5c449b03755e9982d95805a.

GitOrigin-RevId: effbe96b8adff9e39ba73eb274066360fa8df694

java/debugger/impl/src/com/intellij/debugger/ui/tree/render/BatchEvaluator.kt

@@ -106,9 +106,7 @@ class BatchEvaluator private constructor() {
               var count = 0
               while (dis.available() > 0) {
                 val error = dis.readBoolean()
-                val data = ByteArray(dis.readInt())
-                dis.readFully(data)
-                val message = String(data, Charsets.UTF_8)
+                val message = dis.readUTF()
                 if (count >= requests.size) {
                   LOG.error("Invalid number of results: required " + requests.size + ", reply = " + bytes.contentToString())
                   return false

java/java-runtime/src/com/intellij/rt/debugger/BatchEvaluatorServer.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 
 /*
  * @author Eugene Zhuravlev
@@ -8,7 +8,6 @@ package com.intellij.rt.debugger;
 import java.io.ByteArrayOutputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 
 @SuppressWarnings("unused")
 public final class BatchEvaluatorServer {
@@ -34,11 +33,7 @@ public final class BatchEvaluatorServer {
       }
 
       dos.writeBoolean(error);
-      // do not use writeUTF as it supports only 65535 symbols
-      // dos.writeUTF(res);
-      byte[] stringBytes = res.getBytes(StandardCharsets.UTF_8);
-      dos.writeInt(stringBytes.length);
-      dos.write(stringBytes);
+      dos.writeUTF(res);
     }
     return bas.toString("ISO-8859-1");
   }