ECMS-5428: Null in ECMS activities after migration from PLF-3.5 to PLF-4.0.1

Fix description:
  - Update "ActivitiesUpgradePlugin" to fix the problem while migrating content activities that have target node war moved or deleted
  - check in case soc:url is not existing
  - fix the case activities duplicated and jumping
  - Using getParent instead of getAncestor
ECMS-5344 Hidden paging in WCM Content Selector

Fix description:
  - Add the scroll bar
Merge commit '045ace69c49016649a1106bcf28a0cf6e81a3021' into HEAD