BytesRef: Use Utf8ToStringWithFallback in DebuggerDisplay, #1024

Changed DebuggerDisplay attribute to use Utf8ToStringWithFallback() instead of
Utf8ToString() to prevent exceptions when debugging BytesRef instances that
contain invalid UTF-8 sequences.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: paulirwin

src/Lucene.Net/Util/BytesRef.cs

@@ -45,7 +45,7 @@ namespace Lucene.Net.Util
     [Serializable]
 #endif
     // LUCENENET specific: Not implementing ICloneable per Microsoft's recommendation
-    [DebuggerDisplay("{ToString()} {Utf8ToString()}")]
+    [DebuggerDisplay("{ToString()} {Utf8ToStringWithFallback()}")]
     public sealed class BytesRef : IComparable<BytesRef>, IComparable, IEquatable<BytesRef> // LUCENENET specific - implemented IComparable for FieldComparator, IEquatable<BytesRef>
     {
         /// <summary>