FEAT #13679 TIME 2:15 continue refactoring notification scripts

modules/content_management/retrieve_template_from_cm.php

modules/notifications/batch/process_email_stack.php

modules/templates/class/templates_controler_Abstract.php

modules/templates/datasources/letterbox_events.php

modules/templates/datasources/mlb_notes_content.php

modules/templates/datasources/notif_events.php

modules/templates/xml/datasources.xml

src/app/contentManagement/controllers/MergeController.php

...exportSeda/controllers/DOMTemplateProcessorController.php

src/app/history/controllers/HistoryController.php

src/app/template/models/TemplateModelAbstract.php

src/core/controllers/AuthenticationController.php

test/unitTests/app/template/TemplateControllerTest.php

...itTests/app/versionUpdate/VersionUpdateControllerTest.php