fix: return an error message on http2 /query-stream endpoint (#7750)

* fix: added code to fail streams

* fix: add exception callback

* fix: remove error processor code

* fix: remove empty curl file

* fix: checkstyle violation

* chore: Trigger Build

ksqldb-rest-app/src/main/java/io/confluent/ksql/api/impl/QueryEndpoint.java

@@ -343,8 +343,10 @@ public BlockingRowQueue getQueue() {
 
     @Override
     public void onException(final Consumer<Throwable> onException) {
-      // We don't try to do anything on exception for push queries, but rely on the
-      // existing exception handling
+      queryMetadata.setUncaughtExceptionHandler(throwable  -> {
+        onException.accept(throwable);
+        return null;
+      });
     }
 
     @Override