[fix][offload] Fix numerical overflow bug while reading data from tie…

…red storage (apache#18595)

Co-authored-by: druidliu <[email protected]>

tiered-storage/jcloud/src/main/java/org/apache/bookkeeper/mledger/offload/jcloud/impl/BlobStoreBackedInputStreamImpl.java

@@ -182,6 +182,7 @@ public void close() {
 
     @Override
     public int available() throws IOException {
-        return (int) (objectLen - cursor) + buffer.readableBytes();
+        long available = objectLen - cursor + buffer.readableBytes();
+        return available > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) available;
     }
 }