AC-2574 updated variable scope as used in google tag manager module

Author: mahesh-singh-rajawat

app/code/Magento/GoogleGtag/Model/Config/GtagConfig.php

@@ -16,9 +16,9 @@ class GtagConfig
     /**
      * Config paths for using throughout the code
      */
-    private const XML_PATH_ACTIVE = 'google/gtag/analytics4/active';
+    protected const XML_PATH_ACTIVE = 'google/gtag/analytics4/active';
 
-    private const XML_PATH_MEASUREMENT_ID = 'google/gtag/analytics4/measurement_id';
+    protected const XML_PATH_MEASUREMENT_ID = 'google/gtag/analytics4/measurement_id';
 
     /**
      * Google AdWords conversion src
@@ -37,7 +37,7 @@ class GtagConfig
     /**
      * @var ScopeConfigInterface
      */
-    private $scopeConfig;
+    protected $scopeConfig;
 
     /**
      * @param ScopeConfigInterface $scopeConfig