cmd/cli: cache query from self result

So we don't waste time to compute a result which is not likely to be
changed.

cmd/cli/prog.go

@@ -98,6 +98,7 @@ type prog struct {
 	ptrLoopGuard         *loopGuard
 	lanLoopGuard         *loopGuard
 	metricsQueryStats    atomic.Bool
+	queryFromSelfMap     sync.Map
 
 	selfUninstallMu       sync.Mutex
 	refusedQueryCount     int