Closes: #11397

Description

This PR adds the tracking events for M2

• Update the event order_creation_success. Update the event to include the custom property shipping_lines_count to track the number of shipping lines within that order. Event registration: https://github.com/Automattic/tracks-events-registration/pull/2438
• Update the event order_shipping_method_add. Update the event to include the custom property shipping_lines_count to track the number of shipping lines within that order. Event registration: https://github.com/Automattic/tracks-events-registration/pull/2439
• Add the event order_details_shipping_methods_shown triggered in the order details screen when the screen is displaying the shipping lines section. Add the custom property shipping_lines_count to track the number of shipping lines within that order. Event registration: https://github.com/Automattic/tracks-events-registration/pull/2440

Testing instructions

1. Open the app
2. Go to the orders screen
3. Tap on add new order (+)
4. Add a product to enable the shipping section
5. Add a new shipping line to the order
6. Check that the event order_shipping_method_add is triggered and that it contains a custom property shipping_lines_count with the number of shipping lines
7. Optionally add another shipping line to the order
8. Tap on create
9. Check that the event order_creation_success is triggered and that it contains a custom property shipping_lines_count with the number of shipping lines
10. Check that the app navigates to the order details screen
11. Check that the event order_details_shipping_methods_shown is triggered and that it contains a custom property shipping_lines_count with the number of shipping lines

Images/gif

🔵 Tracked: order_shipping_method_add, Properties: {"flow":"creation","shipping_method":"local_pickup","shipping_lines_count":1,"blog_id":222408976,"is_wpcom_store":true,"was_ecommerce_trial":true,"plan_product_slug":"wooexpress-small-bundle-yearly","store_id":"b6468f83-4986-44f1-b4ce-6021649dbf29","is_debug":true,"site_url":"https:\/\/woo-practically-automatic-witch.wpcomstaging.com","cached_woo_core_version":"8.9.1"}

🔵 Tracked: order_creation_success, Properties: {"milliseconds_since_order_add_new":"264904","coupons_count":0,"use_gift_card":false,"shipping_lines_count":2,"blog_id":222408976,"is_wpcom_store":true,"was_ecommerce_trial":true,"plan_product_slug":"wooexpress-small-bundle-yearly","store_id":"b6468f83-4986-44f1-b4ce-6021649dbf29","is_debug":true,"site_url":"https:\/\/woo-practically-automatic-witch.wpcomstaging.com","cached_woo_core_version":"8.9.1"}

🔵 Tracked: order_details_shipping_methods_shown, Properties: {"shipping_lines_count":2,"blog_id":222408976,"is_wpcom_store":true,"was_ecommerce_trial":true,"plan_product_slug":"wooexpress-small-bundle-yearly","store_id":"b6468f83-4986-44f1-b4ce-6021649dbf29","is_debug":true,"site_url":"https:\/\/woo-practically-automatic-witch.wpcomstaging.com","cached_woo_core_version":"8.9.1"}

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.