Execute the 'order.updated' webhook when bulk editing and using the status action buttons (fixes #8116)

[justinshreve]

Fixes #8116.

The order.updated webhook is not executed when changing the order status via the bulk edit tools or the action buttons.

This PR adds a new hook when the status gets updated, and adds that hook to the list of topics for order.updated. Since the list of topic hooks is only flushed when editing or creating a webhook, an upgrade routine is also added so that users upgrading to 2.4 will have the hook execute without having to go manually refresh all of their hooks.

Testing Steps:

• Create a webhook using the "Order Updated" topic (you can also existing webhook after running the upgrade routine)
• Go to /wp-admin/ > WooCommerce > Orders
• Bulk select some orders and change their status
• See that webhooks are fired by looking at the webhook logs
• Go to wp-admin > WooCommerce > Orders
• Mark an order as complete using the action button
• Note that a webhook is fired by looking at the webhook logs

[claudiosanches]

Great work!