Unsupported shortcodes in shipping settings are skipped in silence

[eason9487]

User story

As a user, I'd like to be acknowledged when my WooCommerce shipping settings can't be fully synced to Google Merchant Center.

Context

If a shipping rate contains shortcode(s), then it will be directly omitted from the synchronization without the user's knowledge.

Supported shortcodes:

How to reproduce the problem

1. Go to WooCommerce > Settings > Shipping > Shipping zones and set up a zone with shortcodes.
   
2. Go to edit free listings.
3. Add the above configured zone to the Audience setting.
4. Save changes.
5. Wait a moment for the settings to sync to Google Merchant Center.
6. Go to Google Merchant Center and navigate to Shipping and returns page. The above configured zone (country) is not shown.

Technical

• https://github.com/woocommerce/google-listings-and-ads/blob/2.7.6/src/Shipping/ZoneMethodsParser.php#L122-L140
• https://github.com/woocommerce/woocommerce/blob/9.0.2/plugins/woocommerce/includes/shipping/flat-rate/class-wc-shipping-flat-rate.php#L75-L119