mesh-knowledge: keep when an owed review is due, say it in the history, and tell the operator once after its last try (hq issue 497)

A failed review's try count was already kept with the version, but not when it was asked again, so a 10-minute
pause read as a review lost to a restart; and after the last try only the history and the health said so.

modules/mesh-knowledge/cmd/mesh-knowledge/operator.go

@@ -141,13 +141,8 @@ func (k *KB) askOperator(ctx context.Context, held *Entry, w *Record, by string,
 	}
 	unasked := func(why string) (string, error) {
 		w.Ask = nil
-		w.Judging = &Judging{State: JudgingFailed, Tries: tries + 1, Reason: why, At: k.now()}
-		said := fmt.Sprintf("approved by the knowledge base's review, and %s (try %d of %d); it stays proposed", why, tries+1, MostReviewTries)
-		if tries+1 >= MostReviewTries {
-			said += ", and its author proposes it again to have it reviewed again"
-		} else {
-			said += " and is reviewed again after a pause"
-		}
+		w.Judging = failedJudging(tries+1, why, k.now())
+		said := fmt.Sprintf("approved by the knowledge base's review, and %s (%s", why, w.Judging.owedSays())
 		e, err := k.Store.Get(ctx, w.Key())
 		if err != nil || e == nil {
 			return "", fmt.Errorf("%s: %s, and that could not be kept (%v)", w.Key(), said, err)