For WOOMOB-768

Just one review is required.

Why

This PR hides the retry button in the POS ineligible view when the reason is unsupported iOS version. Since iOS version cannot be changed and refreshed within the app, showing a retry button doesn't make sense for this case.

Description

The implementation adds a computed property shouldShowRetryButton to POSIneligibleReason via a private extension, which returns false for .unsupportedIOSVersion and true for all other cases. The retry button is now conditionally shown using .renderedIf(reason.shouldShowRetryButton).

Additionally, the image in the ineligible UI was updated to X to match the design.

Steps to reproduce

1. If you don't have a device/simulator with iOS 16 (I personally don't), you can hardcode the ineligible reason to .unsupportedIOSVersion in

   woocommerce-ios/WooCommerce/Classes/POS/Presentation/PointOfSaleEntryPointView.swift

   Line 64 in 53e3bca

   POSIneligibleView(reason: reason, onRefresh: {

2. Navigate to POS
3. Observe the ineligible view
4. Verify that only the "Exit POS" button is shown (no retry button), and the image is an X that matches the design y0zZLi1kqybNUUUd8lmvYG-fi-4133_4689

Testing information

I tested unsupportedIOSVersion (hard-coded) and unsupportedWooCommerceVersion cases (as shown in the screenshots) in iOS 18.4 iPad A16 simulator.

Screenshots

The retry button will no longer appear for unsupported iOS version cases, showing only the "Exit POS" button.

other ineligible reason	unsupported iOS version reason

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.