Fix test compilation following upstream change to base class

Author: PeteGillinElastic

test/external-modules/multi-project/src/javaRestTest/java/org/elasticsearch/action/admin/cluster/node/stats/NodesStatsMultiProjectIT.java

@@ -61,7 +61,7 @@ protected Settings restClientSettings() {
 
     @After
     public void deletePipelines() throws IOException {
-        for (String projectId : listProjects()) {
+        for (String projectId : getProjectIds(adminClient())) {
             for (String pipelineId : getPipelineIds(projectId)) {
                 client().performRequest(setRequestProjectId(new Request("DELETE", "/_ingest/pipeline/" + pipelineId), projectId));
             }

test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java

@@ -2826,7 +2826,7 @@ protected void assertProjectIds(RestClient client, List<String> expectedProjects
         );
     }
 
-    private Collection<String> getProjectIds(RestClient client) throws IOException {
+    protected Collection<String> getProjectIds(RestClient client) throws IOException {
         assert multiProjectEnabled;
         final Request request = new Request("GET", "/_cluster/state/routing_table?multi_project=true");
         try {