Coding Standards: Restore more descriptive variable names in a few class methods.

When various methods parameters in child classes were renamed to `$item` to match the parent class for PHP 8 named parameter support, most of the methods restored the more descriptive, specific name at the beginning for better readability, with several exceptions for methods consisting only of a few lines.

To avoid confusion about why some methods do that and some don't, this commit aims to bring more consistency to the code, specifically in list tables' `::column_default()` methods.

Follow-up to [51728], [51737], [51786].

See #58831.

git-svn-id: https://develop.svn.wordpress.org/trunk@56586 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php

@@ -984,9 +984,10 @@ class WP_REST_Users_Controller extends WP_REST_Controller {
 	 */
 	public function prepare_item_for_response( $item, $request ) {
 		// Restores the more descriptive, specific name for use within this method.
-		$user   = $item;
-		$data   = array();
+		$user = $item;
+
 		$fields = $this->get_fields_for_response( $request );
+		$data   = array();
 
 		if ( in_array( 'id', $fields, true ) ) {
 			$data['id'] = $user->ID;