Adds filter hook handle_bulk_actions-woocommerce_page_wc-orders to the HPOS admin list table.

This is a duplicate of core WP hook handle_bulk_actions-<SCREEN_ID> and allows for custom bulk actions to be handled in the context of the admin list table for HPOS orders.

Closes #35414.

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?
• This PR is a very minor change/addition and does not require testing instructions (if checked you can ignore/remove the next section).

How to test the changes in this Pull Request:

First, in case handy, here is a quick reminder on how to enable HPOS, etc 💡

• If necessary, start by running the WooCommerce ▸ Status ▸ Tools ▸ Create Custom Order Tables tool.
• Then, visit WooCommerce ▸ Settings ▸ Advanced ▸ Features and enable High-Performance Order Storage.
• Next, head on over to WooCommerce ▸ Settings ▸ Advanced ▸ Custom Data Stores and:
  • Select Use the WordPress posts table.
  • Select Keep the posts table and the orders tables synchronized.

1. Start by adding the following snippet to a suitable location, such as a wp-content/mu-plugin file (the goal of this snippet is to simulate how a 3PD might add a custom bulk action for orders):

$add_custom_bulk_action = function ( array $bulk_actions ) {
	return array_merge( $bulk_actions, [ 'custom-bulk-action' => 'Perform Custom Action!' ] );
};

$custom_bulk_action_handler = function ( string $redirect_to, string $action, array $ids ) {
	return $action === 'custom-bulk-action'
		? add_query_arg( 'bulk_action', 'custom-bulk-action-notice', $redirect_to )
		: $redirect_to;
};

$custom_bulk_action_notice = function () {
	if ( isset( $_GET['bulk_action'] ) && 'custom-bulk-action-notice' === $_GET['bulk_action'] ) {
		print '<div class="updated" style="border-left-color: #d7f"><p>Custom Bulk Action Handler Fired</p></div>';
	}
};

add_filter( 'bulk_actions-woocommerce_page_wc-orders', $add_custom_bulk_action );
add_filter( 'handle_bulk_actions-woocommerce_page_wc-orders', $custom_bulk_action_handler, 10, 3 );
add_action( 'admin_notices', $custom_bulk_action_notice );

2. With HPOS enabled (and WooCommerce Orders Tables set as the authoritative data store for orders), visit the order list screen. You should see a new bulk action ("Perform Custom Action!"):

3. Check the boxes for one or more order rows, select the above bulk action, and click on the "Apply" button. Once the page finishes reloading, you should see an admin notice like the following one:

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? No, we generally don't add tests when we add new hooks in isolation (within WooCommerce, nothing functional is actually changing).
• Have you created a changelog file for each project being changed, ie pnpm --filter=<project> changelog add?

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.