nomad/state: remove dead upgrade path code

It is uncalled so there hsould be no runtime changes.

nomad/state/state_store.go

@@ -3581,25 +3581,6 @@ func (s *StateStore) updateSummaryWithAlloc(index uint64, alloc *structs.Allocat
 	return nil
 }
 
-// addEphemeralDiskToTaskGroups adds missing EphemeralDisk objects to TaskGroups
-func (s *StateStore) addEphemeralDiskToTaskGroups(job *structs.Job) {
-	for _, tg := range job.TaskGroups {
-		var diskMB int
-		for _, task := range tg.Tasks {
-			if task.Resources != nil {
-				diskMB += task.Resources.DiskMB
-				task.Resources.DiskMB = 0
-			}
-		}
-		if tg.EphemeralDisk != nil {
-			continue
-		}
-		tg.EphemeralDisk = &structs.EphemeralDisk{
-			SizeMB: diskMB,
-		}
-	}
-}
-
 // UpsertACLPolicies is used to create or update a set of ACL policies
 func (s *StateStore) UpsertACLPolicies(index uint64, policies []*structs.ACLPolicy) error {
 	txn := s.db.Txn(true)
@@ -4196,22 +4177,3 @@ func (r *StateRestore) SchedulerConfigRestore(schedConfig *structs.SchedulerConf
 	}
 	return nil
 }
-
-// addEphemeralDiskToTaskGroups adds missing EphemeralDisk objects to TaskGroups
-func (r *StateRestore) addEphemeralDiskToTaskGroups(job *structs.Job) {
-	for _, tg := range job.TaskGroups {
-		if tg.EphemeralDisk != nil {
-			continue
-		}
-		var sizeMB int
-		for _, task := range tg.Tasks {
-			if task.Resources != nil {
-				sizeMB += task.Resources.DiskMB
-				task.Resources.DiskMB = 0
-			}
-		}
-		tg.EphemeralDisk = &structs.EphemeralDisk{
-			SizeMB: sizeMB,
-		}
-	}
-}