style(codespaces): comment PHP unit testing setup for now

.devcontainer/postCreateCommand.sh

@@ -8,8 +8,8 @@ ln -s ./conf.sample.php cfg/conf.php
 composer install --no-dev --optimize-autoloader
 
 # for PHP unit testing
-composer require google/cloud-storage
-composer install --optimize-autoloader
+# composer require google/cloud-storage
+# composer install --optimize-autoloader
 
 sudo chmod a+x "$(pwd)" && sudo rm -rf /var/www/html && sudo ln -s "$(pwd)" /var/www/html