Refactor scroll-and-highlight to use React context instead of direct DOM manipulation (4272)

[danieldudzic]

This PR is dependent on changes from https://github.com/woocommerce/woocommerce-paypal-payments/tree/dev/release/4.0.2

Description

Refactors the scroll-and-highlight system from direct DOM manipulation (classList.add/remove, document.getElementById) to a React context-based approach using ScrollHighlightProvider, useScrollTarget, and useScrollTo hooks.

Steps to Test

1. Go to WooCommerce → Settings → PayPal Payments → Payment Methods tab
2. Find a payment method with a dependency message (e.g. one that requires another method to be enabled/disabled)
3. Click the dependency link - verify it scrolls to the target element and highlights it with a blue border that fades out over 2 seconds
4. Go to the Overview tab and click a feature's "Configure" / action button — verify it switches tabs and scrolls to the correct section
5. Navigate to the settings page with a ?highlight=ppcp-save-paypal-and-venmo URL parameter — verify it scrolls to "Save PayPal and Venmo" and highlights it
6. Verify the highlight parameter is cleaned from the URL after scrolling
7. Keyboard-test the dependency message links — verify they are focusable and activatable with Enter/Space