Tests: make sure to load timezones in parent classloader

When GroovySecurityTests are run before any other test using
time zones, joda ZoneInfoProvider fails to load the time zones
correctly and never tries again later. This makes sure we load it
correctly on startup.

Relates to #14524

plugins/lang-groovy/src/test/java/org/elasticsearch/script/groovy/GroovySecurityTests.java

@@ -39,6 +39,12 @@ public class GroovySecurityTests extends ESTestCase {
 
     private GroovyScriptEngineService se;
 
+    static {
+        // ensure we load all the timezones in the parent classloader with all permissions
+        // relates to https://github.com/elastic/elasticsearch/issues/14524
+        org.joda.time.DateTimeZone.getDefault();
+    }
+
     @Override
     public void setUp() throws Exception {
         super.setUp();