Re-enable SingleNodeTests.testThatLoadingWithNonExistingIndexWorks (#82118)

The PR re-enables a test that has been muted for a while.
A few improvements have been made that are suspected
to allow this test to pass now. Also, the timeout has been
bumped up to help with the stability of this test.

closes #54096

x-pack/plugin/watcher/src/internalClusterTest/java/org/elasticsearch/xpack/watcher/test/integration/SingleNodeTests.java

@@ -40,7 +40,6 @@ public class SingleNodeTests extends AbstractWatcherIntegrationTestCase {
     // this is the standard setup when starting watcher in a regular cluster
     // the index does not exist, a watch gets added
     // the watch should be executed properly, despite the index being created and the cluster state listener being reloaded
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/54096")
     public void testThatLoadingWithNonExistingIndexWorks() throws Exception {
         stopWatcher();
         ClusterStateResponse clusterStateResponse = client().admin().cluster().prepareState().get();
@@ -64,7 +63,7 @@ public class SingleNodeTests extends AbstractWatcherIntegrationTestCase {
             client().admin().indices().prepareRefresh(".watcher-history*");
             SearchResponse searchResponse = client().prepareSearch(".watcher-history*").setSize(0).get();
             assertThat(searchResponse.getHits().getTotalHits().value, is(greaterThanOrEqualTo(1L)));
-        }, 5, TimeUnit.SECONDS);
+        }, 30, TimeUnit.SECONDS);
     }
 
 }