feature: added subscription expiration date for premium v2 (#1261)

* feature: added subscription expiration date for premium v2

* feature: added a check for the presence of the “services” field in the response body of the getServicesList() function

* feature: added prohibition to change location when connection is active

* bugfix: renamed public_key->end_date to public_key->expires_at according to the changes on the backend

client/core/controllers/apiController.cpp

@@ -379,6 +379,13 @@ ErrorCode ApiController::getServicesList(QByteArray &responseBody)
 
     auto errorCode = checkErrors(sslErrors, reply);
     reply->deleteLater();
+
+    if (errorCode == ErrorCode::NoError) {
+        if (!responseBody.contains("services")) {
+            return ErrorCode::ApiServicesMissingError;
+        }
+    }
+
     return errorCode;
 }