Address PR feedback: fix test assertions and code alignment

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

features/config-add.feature

@@ -33,16 +33,16 @@ Feature: Add a constant or variable to wp-config.php file
   Scenario: Add a raw constant to wp-config.php
     Given a WP install
 
-    When I run `wp config add WP_DEBUG true --raw`
+    When I run `wp config add WP_CUSTOM_CONSTANT true --raw`
     Then STDOUT should be:
       """
-      Success: Added the constant 'WP_DEBUG' to the 'wp-config.php' file with the raw value 'true'.
+      Success: Added the constant 'WP_CUSTOM_CONSTANT' to the 'wp-config.php' file with the raw value 'true'.
       """
 
-    When I run `wp config list WP_DEBUG --strict --format=json`
+    When I run `wp config list WP_CUSTOM_CONSTANT --strict --format=json`
     Then STDOUT should contain:
       """
-      {"name":"WP_DEBUG","value":true,"type":"constant"}
+      {"name":"WP_CUSTOM_CONSTANT","value":true,"type":"constant"}
       """
 
   Scenario: Fail when trying to add an existing constant

features/config-update.feature

@@ -78,7 +78,7 @@ Feature: Update or add a constant or variable in wp-config.php file
     When I run `wp config update WP_DEBUG true --raw`
     Then STDOUT should be:
       """
-      Success: Added the constant 'WP_DEBUG' to the 'wp-config.php' file with the raw value 'true'.
+      Success: Updated the constant 'WP_DEBUG' in the 'wp-config.php' file with the raw value 'true'.
       """
 
     When I run `wp config list WP_DEBUG --strict --format=json`

src/Config_Command.php

@@ -853,7 +853,7 @@ public function add( $args, $assoc_args ) {
 			WP_CLI::error( "Could not process the '{$wp_config_file_name}' transformation.\nReason: {$exception->getMessage()}" );
 		}
 
-		$raw = $options['raw'] ? 'raw ' : '';
+		$raw     = $options['raw'] ? 'raw ' : '';
 		$message = "Added the {$type} '{$name}' to the '{$wp_config_file_name}' file with the {$raw}value '{$value}'.";
 
 		WP_CLI::success( $message );