FOLD/UNFOLD aggregates highlighted as invalid in Fuseki UI

### Version

5.2.0

### What happened?

A recent version of Jena added the support for [SPARQL CDTs](https://awslabs.github.io/SPARQL-CDTs/spec/latest.html#description-of-fold), which includes a new aggregate (FOLD) and an operator (UNFOLD). The two thingies work fine, but in the SPARQL editor in the Fuseki UI, they are highlighted in red as invalid syntax.

Example query:

```sparql
SELECT ?s (FOLD(?p, ?o) AS ?map) WHERE {
?s ?p ?o
}
GROUP BY ?s
```

How it appears in the editor:

Second example:

```sparql
SELECT * WHERE {
?s ?p ?list .
UNFOLD(?list as ?element)
}
```


### Relevant output and stacktrace

_No response_

### Are you interested in making a pull request?

None

Start in the Fuseki UI's SPARQL editor and inspect the syntax-highlighting definitions for aggregate functions and operators. Compare the handling of FOLD and UNFOLD with other valid SPARQL syntax, then verify that both examples are no longer highlighted as invalid.

Written by the indexing model from the issue text.