Closes WOOMOB-1456

Description

This PR adds the feature flag for POS Surveys, as well as defines the LocalNotification case for the "potential merchant" case (unused). A potential merchant right now is just anybody that creates an order in the app, later on will narrow down the conditions further to send this notification.

Changes

We expand the current behavior of handleNotificationInTheForeground, which at the moment only handles remote push notifications, not local ones. This method is currently only used for tests, also I've confirmed with Kiwi how current Blaze notifications work at: p1760012173127899-slack-C03L1NF1EA3 just to be sure, and these only happen in the background.

Testing

The notification code is not currently used:

1. Be sure you've given notification permissions to the app.
2. Go to PaymentMethodsViewModel, and add a call to scheduleNotification() inside PaymentMethodsViewModel.trackFlowCompleted:

    /// Tracks the `paymentsFlowCompleted` event.
    ///
    func trackFlowCompleted(method: WooAnalyticsEvent.PaymentsFlow.PaymentMethod,
                            cardReaderType: WooAnalyticsEvent.PaymentsFlow.CardReaderType?) {
        let currencyFormatter = CurrencyFormatter(currencySettings: currencySettings)
        let amountNormalized = currencyFormatter.convertToDecimal(total) ?? 0

        let amountInSmallestUnit = amountNormalized
            .multiplying(by: NSDecimalNumber(value: currencySettings.currencyCode.smallestCurrencyUnitMultiplier))
            .intValue

+        scheduleNotification()

    private func scheduleNotification() {
        Task { @MainActor in
            let seconds = TimeInterval(3)
            let notification = LocalNotification(title: "Hello",
                                                 body: "Some more text",
                                                 scenario: .pointOfSalePotentialMerchant,
                                                 actions: nil,
                                                 userInfo: [:])
            let trigger = UNTimeIntervalNotificationTrigger(timeInterval: seconds, repeats: false)

            await ServiceLocator.pushNotesManager.requestLocalNotification(notification, trigger: trigger)
        }
    }

2. On a physical device: Run the app > Orders > Create an Order > Collect the payment
3. Upon success, the local notification will appear after 3 seconds

Screenshots