Add entitlement annotation to allow renderDocs (elastic#134578)

Author: prdoyle

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/AbstractFunctionTestCase.java

@@ -117,6 +117,7 @@
 /**
  * Base class for function tests.
  */
+@ESTestCase.EntitledTestPackages({ "sun.font", "sun.awt" }) // For renderDocs
 public abstract class AbstractFunctionTestCase extends ESTestCase {
     /**
      * Operators are unregistered functions.