Fix settings notifications (4672)

[danieldudzic]

Description

This PR fixes the broken settings notifications.

• Add Notifications component using WordPress SnackbarList
• Add SuccessIcon and ErrorIcon SVG components replacing emoji icons
• Update useNotices hook with auto-dismiss (5 seconds) and manual dismiss button
• Style notifications to match WooCommerce notifications (dark background, blur effect, proper spacing)
• Refactor existing components to use the centralized useNotices hook

Screenshots

WooCommerce notifications	PayPal Settings notifications

Steps to Test

1. Go to 'PayPal Payments settings'
2. Click on 'Restore dismissed Things To Do'
3. Verify success notification appears with green checkmark icon
4. Verify notification auto-dismisses after 5 seconds
5. Click the '✕' button to manually dismiss

[github-actions]

Test using WordPress Playground

The changes in this pull request can be previewed and tested using a WordPress Playground instance.
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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.3.2-pr4034-21183242905-g612e44a (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.3.2-pr4034-21183242905-g612e44a
• Commit: 612e44a
• Artifact: woocommerce-paypal-payments-3.3.2-pr4034-21183242905-g612e44a

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