fix: add mongo ping detection

pkg/common/db/unrelation/mongo.go

@@ -54,6 +54,9 @@ func NewMongo() (*Mongo, error) {
 		defer cancel()
 		mongoClient, err = mongo.Connect(ctx, options.Client().ApplyURI(uri))
 		if err == nil {
+			if err = mongoClient.Ping(ctx, nil); err != nil {
+				return nil, errs.Wrap(err, uri)
+			}
 			return &Mongo{db: mongoClient}, nil
 		}
 		if shouldRetry(err) {