backport of commit 1f1ead0dc7 (#23616)

Co-authored-by: Josh Black <raskchanky@gmail.com>

vault/core_util.go

@@ -74,6 +74,7 @@ func (c *Core) barrierViewForNamespace(namespaceId string) (*BarrierView, error)
 
 func (c *Core) UndoLogsEnabled() bool            { return false }
 func (c *Core) UndoLogsPersisted() (bool, error) { return false, nil }
+func (c *Core) EnableUndoLogs()                  {}
 func (c *Core) PersistUndoLogs() error           { return nil }
 
 func (c *Core) teardownReplicationResolverHandler() {}

vault/raft.go

@@ -198,6 +198,7 @@ func (c *Core) monitorUndoLogs() error {
 	}
 
 	if persisted {
+		c.EnableUndoLogs()
 		logger.Debug("undo logs are safe, no need to check any more")
 		return nil
 	}