Backport the most critical fix from MID-5920

"Actions executed" counters were increased without any reason. This is
now fixed.

However, other fixes from ddccc84 cannot
be backported right now. They deal with multi-threaded LiveSync and their
incorporation would mean bringing more new code into 4.0.x.

infra/schema/src/main/java/com/evolveum/midpoint/schema/statistics/ActionsExecutedInformation.java

@@ -90,7 +90,7 @@ public static void addTo(List<ObjectActionsExecutedEntryType> sumEntries, List<O
             if (matchingEntry != null) {
                 addToEntry(matchingEntry, entry);
             } else {
-                sumEntries.add(entry);
+                sumEntries.add(entry.clone());
             }
         }
     }