Implement missing refund tax methods for HPOS

[vedanshujain]

All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Implements remaining get_total_tax_refunded and get_total_shipping_refunded methods for HPOS data store.

How to test the changes in this Pull Request:

While HPOS as active

1. Enable taxes and add a sample tax rate (also enabled for shipping).
2. Create a new order, add some products and add a shipping rate. Calculate taxes.
3. In a shell prompt, test the implementation like so:

$order_id = XX; //Your order ID.
$order = wc_get_order( $order_id );
$order->get_data_store()->get_total_tax_refunded( $order );
$order->get_data_store()->get_total_shipping_refunded( $order );

Alternatively, check unit tests and see if they make sense.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Have you created a changelog file for each project being changed, ie pnpm changelog add --filter=<project>?

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[github-actions]

Test Results Summary

Commit SHA: de22a84

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	188	0	0	2	0	190	0m 57s
E2E Tests	186	0	0	3	0	189	13m 28s

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To view the full E2E test report, click here.
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[github-actions]

Hi @Konamiman, thanks for merging this pull request. Please take a look at these follow-up tasks you may need to perform:

• Add the release: add testing instructions label

[oujisan2236]

hi there

issue now is this

on orders when you view them in the backend wp-admin/post.php?post=example&action=edit

lets say

cost qty total vat

will show cost then the qty but total is without vat and then vat so cost is repeated twice without a total

cant see what the cost plus vat is without using a calculator to make sure its right... was not like this before 7.1

for example
https://ibb.co/yWzK3CR