Index posts after Woocommerce custom sort

[MARQAS]

Description of the Change

This PR will resolve the WooCommerce custom sort while using EP

Closes #2928

How to test the Change

• With Woocommerce and EP enabled, go to Products
• Click on "sorting"
• Reorder your products and reload
• See the ordering has been applied
• Visit the shop page and see the ordering is applied

Changelog Entry

Fixed - Woocommerce custom sort

Credits

Props @MARQAS, @felipeelia

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[felipeelia]

This PR now needs some e2e tests:

1. If Content Items per Index Cycle is greater than the number of products, the reorder should trigger a reindex, and reloading the screen should display the correct (new) order
2. If Content Items per Index Cycle is lower than the number of products, the reorder should NOT trigger a reindex, and a notice indicating the need for a resync should be displayed.

[felipeelia]

Let's change the text to Due to the number of products in the site, you will need to <a href="%s">resync</a> after applying a custom sort order.