Revert "Mute TransformSurvivesUpgradeIT#testTransformRollingUpgrade."

This reverts commit 86d720d.

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

@@ -128,7 +128,6 @@ protected RestClient buildClient(Settings settings, HttpHost[] hosts) throws IOE
      * The purpose of this test is to ensure that when a job is open through a rolling upgrade we upgrade the results
      * index mappings when it is assigned to an upgraded node even if no other ML endpoint is called after the upgrade
      */
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/56196")
     public void testTransformRollingUpgrade() throws Exception {
         assumeTrue("Continuous transform time sync not fixed until 7.4", UPGRADE_FROM_VERSION.onOrAfter(Version.V_7_4_0));
         Request adjustLoggingLevels = new Request("PUT", "/_cluster/settings");