Closes the last open loop of the HealthKit feature (decision C from
HealthKit-Delete-Loop.md, now retired): the history-list delete dialog
gains a "Delete + Remove from Apple Health" option, shown only when the
workout has a Health record. Removal is best-effort via the workout's
stored HKWorkout UUID; watch-recorded workouts are authored by the
watch app's separate HealthKit source and may be refused, so the dialog
notes they may need deleting in the Health app instead. Discarding an
in-progress workout is unaffected (no Health record exists yet).