Describe the bug
As of v25 there is no longer a hook into dataLoaderRegistry.dispatchAll() (prev code) within PerLevelDataLoaderDispatchStrategy. This previously allowed us to take advantage of the
ScheduledDataLoaderRegistry feature within the java-dataloader library for specifying DispatchPredicate's per dataloader. It's not clear to me if I'm missing some new mechanism that replaces this, or if this is just a regression/bug.

To Reproduce
Not a very minimal set up at all (sorry), but you can see how the difference in behavior affects us by comparing this branch to master and using the messageLoaderWithScheduledDispatch test.