[Woo POS][Surveys] Make PointOfSaleNotificationScheduler for initial eligibility schedule triggers

[iamgabrielma]

Partially closes WOOMOB-1458
Partially closes WOOMOB-1460

Description

This PR centralizes POS surveys notification eligibility and scheduling in a single PointOfSaleNotificationScheduler place, and adds the initial eligibility conditions (feature flag and country).

Testing information

The class is currently unused, in order to test:

1. Add the following bit to EditableOrderViewModel.onCreateOrderTapped():

    func onCreateOrderTapped() {
        createOrder { [weak self] order, usesGiftCard in
            guard let self else { return }
            self.onFinished(order)
            self.trackCreateOrderSuccess(usesGiftCard: usesGiftCard)
+            Task {
+                await PointOfSaleNotificationScheduler().scheduleLocalNotificationIfEligible(for: .potentialMerchant)
+            }
        } onFailure: { [weak self] error, usesGiftCard in
            guard let self else { return }
            self.fixedNotice = NoticeFactory.createOrderErrorNotice(error, order: self.orderSynchronizer.order)
            self.trackCreateOrderFailure(usesGiftCard: usesGiftCard, error: error)
        }
        trackCreateButtonTapped()
    }

2. Update PointOfSaleNotificationScheduler.timeIntervalInSeconds.potentialMerchant to 5 seconds or so:

        var timeIntervalInSeconds: Int {
            switch self {
            case .potentialMerchant:
-               return 60
+               return 5

3. In a physical device, running an US or UK store, go to Orders and create an order.
4. Observe the notification appearing.

Screenshots

2025-10-14.trigger.notification.on.order.creation.mov

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr16238-5eafca4
	Version	23.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	5eafca4
	Installation URL	7u3605qb0387o

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[staskus]

✅ Nice! Tidy work 👍

[staskus]

nit; We haven't renamed everything yet, but I think we decided to call things with POS prefix

Suggested change

	final class PointOfSaleNotificationScheduler: PointOfSaleNotificationScheduling {
	final class POSNotificationScheduler: POSNotificationScheduling {