[MM-30984] Missing payment email on billing day if no CC is present (#16442)

* Adding email and scaffolding for payment failure in case where customer has not added payment method

* Adding email template

* Remove unused boolean

* Fix error

* Add Email Us verbiage

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/cloud.go

@@ -75,3 +75,19 @@ func (a *App) SendPaymentFailedEmail(failedPayment *model.FailedPayment) *model.
 	}
 	return nil
 }
+
+// SendNoCardPaymentFailedEmail
+func (a *App) SendNoCardPaymentFailedEmail() *model.AppError {
+	sysAdmins, err := a.getSysAdminsEmailRecipients()
+	if err != nil {
+		return err
+	}
+
+	for _, admin := range sysAdmins {
+		err := a.Srv().EmailService.SendNoCardPaymentFailedEmail(admin.Email, admin.Locale, *a.Config().ServiceSettings.SiteURL)
+		if err != nil {
+			a.Log().Error("Error sending payment failed email", mlog.Err(err))
+		}
+	}
+	return nil
+}