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Implements https://github.com/openedx/edx-platform/issues/30682 Produce signal only once transaction for a course publish is committed, and only for actual courses (not libraries). - Use newer openedx-events version that has a fix for None datetime and that has CourseCatalogData without org, number. - Add edx-event-bus-kafka -- specify recent version that drops confluent-kafka from explicit deps, fixes common auth settings, and has a multi-producer caching tweak. - New functionality is behind toggle As per https://github.com/openedx/openedx-events/issues/88 we're going to try explicit dependencies on implementations for now, rather than solve all the problems we'd encounter by using private dependencies. Co-authored-by: Tim McCormack <tmccormack@edx.org> Co-authored-by: Rebecca Graber <rgraber@edx.org>