Show message to the user after a successful certificate installation (#951)

* Show message to the user after a successful certificate installation

* Show a simplified message (different for install and uninstall cases)

---------

Co-authored-by: Xayton <[email protected]>

Author: MatteoPologruto

Diff for: certificates/certificates.go

@@ -32,6 +32,7 @@ import (
 	"os"
 	"time"
 
+	"github.com/arduino/arduino-create-agent/utilities"
 	"github.com/arduino/go-paths-helper"
 	log "github.com/sirupsen/logrus"
 )
@@ -286,4 +287,5 @@ func GenerateAndInstallCertificates(certDir *paths.Path) {
 		log.Errorf("cannot install certificates something went wrong: %s", err)
 		DeleteCertificates(certDir)
 	}
+	utilities.UserPrompt("The HTTPS certificate has been installed correctly.", "{\"OK\"}", "OK", "OK", "Arduino Agent: HTTPS certificate installation")
 }

Diff for: systray/systray_real.go

@@ -117,6 +117,7 @@ func (s *Systray) start() {
 							if err != nil {
 								log.Errorf("cannot set installCerts value in config.ini: %s", err)
 							}
+							utilities.UserPrompt("The HTTPS certificate has been uninstalled.", "{\"OK\"}", "OK", "OK", "Arduino Agent: HTTPS certificate installation")
 						}
 						s.Restart()
 					}