mesh-knowledge: give a never-reviewed notice its resolved line when raised, and test a refused clear and local time in a set zone (review of #219)

The operator's channel edits a cleared message with the resolved line it was raised with, so one sent only with
the clear was never shown.

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

@@ -225,9 +225,13 @@ func busJudgement(node string) Judgement {
 }
 
 // busNotifier tells the operator's channel, as a warning: it is the one severity below urgent.
-func busNotifier(key, summary, headline, explanation string) error {
-	_, err := stdio.Ask("seat:operator-channel.notify", map[string]any{"key": key, "subject": "the knowledge base",
-		"severity": "warning", "summary": summary, "headline": headline, "explanation": explanation})
+func busNotifier(key, summary, headline, explanation, resolved string) error {
+	body := map[string]any{"key": key, "subject": "the knowledge base",
+		"severity": "warning", "summary": summary, "headline": headline, "explanation": explanation}
+	if resolved != "" {
+		body["resolved"] = resolved
+	}
+	_, err := stdio.Ask("seat:operator-channel.notify", body)
 	return err
 }