Revert "[8.x] Add a cluster listener to fix missing system index mappings after upgrade (#115771)"

This reverts commit d698e72.

Author: brianseeders

qa/rolling-upgrade/src/javaRestTest/java/org/elasticsearch/upgrades/SystemIndexMappingUpgradeIT.java

@@ -20,6 +20,6 @@ public class TransportFeatures implements FeatureSpecification {
     public Map<NodeFeature, Version> getHistoricalFeatures() {
         // transport version was introduced in 8.8.0, but we need to wait until all nodes are >8.8.0
         // to properly detect when we need to fix transport versions
-        return Map.of(CompatibilityVersionsFixupListener.FIX_TRANSPORT_VERSION, Version.V_8_8_1);
+        return Map.of(TransportVersionsFixupListener.FIX_TRANSPORT_VERSION, Version.V_8_8_1);
     }
 }