Revert "[TEST] Muted TokenBackwardsCompatibilityIT.*"

This reverts commit 65e42ab63bb6e764ea9f547b42bf82b3ef465881.

The test is only failing in 6.x not master.

x-pack/qa/rolling-upgrade/src/test/java/org/elasticsearch/upgrades/TokenBackwardsCompatibilityIT.java

@@ -7,7 +7,6 @@ package org.elasticsearch.upgrades;
 
 import org.apache.http.HttpHeaders;
 import org.apache.http.HttpHost;
-import org.apache.lucene.util.LuceneTestCase.AwaitsFix;
 import org.elasticsearch.Version;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.RequestOptions;
@@ -27,7 +26,6 @@ import java.util.Map;
 import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.hamcrest.Matchers.equalTo;
 
-@AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/37379")
 public class TokenBackwardsCompatibilityIT extends AbstractUpgradeTestCase {
 
     public void testGeneratingTokenInOldCluster() throws Exception {