Issue #3015810 by alexpott, longwave, Berdir: Properly deprecate UPDATE_* constants

core/modules/update/src/Form/UpdateManagerUpdate.php

.../modules/update/templates/update-project-status.html.twig

...modules/update/tests/src/Functional/UpdateContribTest.php

core/modules/update/update.api.php

core/modules/update/update.compare.inc

core/modules/update/update.fetch.inc

core/modules/update/update.install

core/modules/update/update.module

core/modules/update/update.report.inc

...es/stable/templates/admin/update-project-status.html.twig