This commit fixes a regression introduced by gh-24560, when adding
execution metadata support for scheduled tasks. The
`OutcomeTrackingRunnable` would delegate to the actual runnable but
could also hide whether it implements the `SchedulingAwareRunnable`
contract.
This commit ensures that `OutcomeTrackingRunnable` always implements
that contract and delegates to the runnable if possible, or return
default values otherwise.
Fixes gh-34058
0c688742e1