[MM-32626] Disable notices for migrations test helper (#17058)

* app/server: make initial product notice fetch blocking

* disable notices on migrations_test helper

app/server.go

@@ -595,7 +595,11 @@ func NewServer(options ...Option) (*Server, error) {
 
 	// if enabled - perform initial product notices fetch
 	if *s.Config().AnnouncementSettings.AdminNoticesEnabled || *s.Config().AnnouncementSettings.UserNoticesEnabled {
-		go fakeApp.UpdateProductNotices()
+		go func() {
+			if err := fakeApp.UpdateProductNotices(); err != nil {
+				mlog.Warn("Failied to perform initial product notices fetch", mlog.Err(err))
+			}
+		}()
 	}
 
 	return s, nil