XWIKI-19224: Pages containing used XClass get deleted even if they are not...

XWIKI-19224: Pages containing used XClass get deleted even if they are not selected from the tree when Delete action is performed from the page itself
XWIKI-19233: Cannot delete a translated xclass document

  * Ensure that the concernedEntities map is properly manipulated in
    AbstractEntityJobWithChecks
  * Ensure to not perform XClass check in XClassDeletingListener when
    the page to be deleted is a translation
  * Add new dedicated integration tests in DeletePageIT to check the
    scenario related to the tickets

(cherry picked from commit 447616fa)