Issue #2851635 by tim.plunkett, alexpott, dawehner: DefaultSingleLazyPluginCollection retains stale instance IDs

Issue #2779647 by alexpott, Sam152, catch, scookie, yoroy, pericxc, timmillwood, tacituseu, jhedstrom, xjm, bojanz, tstoeckler: Add a workflow component, ui module, and implement it in content moderation