Merge pull request DSpace#9297 from DSpace/backport-9293-to-dspace-7_x

[Port dspace-7_x] Call cas.init() method in the VocabularyRestRepositoryIT#setup method

dspace-server-webapp/src/test/java/org/dspace/app/rest/VocabularyRestRepositoryIT.java

@@ -92,6 +92,11 @@ public void setup() throws Exception {
         // the properties that we're altering above and this is only used within the tests
         DCInputAuthority.reset();
         pluginService.clearNamedPluginClasses();
+
+        // The following line is needed to call init() method in the ChoiceAuthorityServiceImpl class, without it
+        // the `submissionConfigService` will be null what will cause a NPE in the clearCache() method
+        // https://github.com/DSpace/DSpace/issues/9292
+        cas.getChoiceAuthoritiesNames();
         cas.clearCache();
 
         context.turnOffAuthorisationSystem();