fix: Fix the property names when initializing the SDK with ServiceAcc…

…ount type (#2779)

src/app/credential-internal.ts

@@ -473,6 +473,10 @@ function populateGoogleAuth(keyFile: string | object, httpAgent?: Agent)
         'Service account must be an object.',
       );
     }
+    copyAttr(keyFile, keyFile, 'project_id', 'projectId');
+    copyAttr(keyFile, keyFile, 'private_key', 'privateKey');
+    copyAttr(keyFile, keyFile, 'client_email', 'clientEmail');
+
     client = auth.fromJSON(keyFile);
   }
   return { auth, client };