Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

Adds a new action called order_edit_form_top as a replacement for edit_form_top for HPOS.

Closes #37715

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Add the following code snippet that will trigger this action:

add_action( 'order_edit_form_top', function ($order) {
if ( $order instanceof WC_Order) {
    echo "<h1>Action order_edit_form_top triggered.</h1>";
}
}, 10, 1);

2. Switch to use HPOS and open any order for edit (or add new order from admin view)
3. You will see this heading Action order_edit_form_top triggered. just before the order basic details meta box.

Changelog entry

• Automatically create a changelog entry from the details below.