All domain loading is dangerous

Actually, we don't get any benefit here as domains are config entities, and we need to load them all and filter or apply ranges. So the real optimization is to add the configuration variable which allows to decide whether cookie banners should be domain dependent.

I found that the fastest way is just to try to get the active domain. Any additional checks create more load.

Moreover, iterating over all domains in EuCcClearCache.php can be too slow. I suggest to clear caches by invalidating cache tags.