Re-introduce woocommerce_product_csv_importer_check_import_file_path as deprecated

[Konamiman]

The hook was inadvertendlty removed in PR #32460.
Reintroducing it as a deprecated hook in favor of
woocommerce_csv_importer_check_import_file_path.

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:

The woocommerce_product_csv_importer_check_import_file_path was inadvertently removed in #32460. Here we reintroduce it but as deprecated hook.

How to test the changes in this Pull Request:

1. Add this snippet to the WooCommerce code, for example in woocommerce.php:

function test_hook_deprecation(){
	add_filter('woocommerce_product_csv_importer_check_import_file_path', function ($value) {
		echo("Old filter called with: $value\n");
		return $value . '_modified';
	});

	$value = apply_filters('woocommerce_csv_importer_check_import_file_path', 'thefilename');
	echo("Result of the new filter call: $value\n");
};

2. Execute the code with wp eval 'test_hook_deprecation();', you should get the following:

PHP Deprecated:  woocommerce_product_csv_importer_check_import_file_path is <strong>deprecated</strong> since version 6.5.0! Use woocommerce_csv_importer_check_import_file_path instead. in /home/konamiman/wordpress/wp-includes/functions.php on line 5691
Old filter called with: thefilename
Result of the new filter call: thefilename_modified

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 by running pnpm nx affected --target=changelog?

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.

[Konamiman]

Hi @jorgeatorres, note that this PR is blocked until we confirm if this is really going into Woo 6.5 (if not it will require changes), so please don't merge yet.

[claudiosanches]

Looks great, thanks!

[github-actions]

Hi @claudiosanches, 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