Enable CronEvalToolTest.testEnsureDateIsShownInRootLocale (#38394)

The test is now expected to be always passing no matter what the random
locale is. This is fixed with using jdk ZoneId.systemDefault() in both
the test and CronEvalTool

closes #35687

x-pack/plugin/watcher/src/test/java/org/elasticsearch/xpack/watcher/trigger/schedule/tool/CronEvalToolTests.java

@@ -56,7 +56,6 @@ public void testGetNextValidTimes() throws Exception {
 
     // randomized testing sets arbitrary locales and timezones, and we do not care
     // we always have to output in standard locale and independent from timezone
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/35687")
     public void testEnsureDateIsShownInRootLocale() throws Exception {
         String output = execute("-c","1", "0 0 11 ? * MON-SAT 2040");
         if (ZoneId.systemDefault().equals(ZoneOffset.UTC)) {