Mute MlJobSnapshotUpgradeIT::testSnapshotUpgrader (#99565)

For #98560 and #99547

Author: davidkyle

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

@@ -66,6 +66,7 @@ protected static void waitForPendingUpgraderTasks() throws Exception {
      * 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/98560")
     public void testSnapshotUpgrader() throws Exception {
         Request adjustLoggingLevels = new Request("PUT", "/_cluster/settings");
         adjustLoggingLevels.setJsonEntity("""