Add guide about using Statamic alongside Laravel Nightwatch

[duncanmcclean]

If you're not careful, installing Laravel Nightwatch in a Statamic project can be a sure-fire way to run through your Nightwatch event quota.

I've previously written in detail about why this happens in a GitHub discussion but we should probably mention it on the docs as well.

You can either workaround it by ignoring all cache events via an env variable:

NIGHTWATCH_IGNORE_CACHE_EVENTS=true

Alternatively, you could filter out Statamic's cache keys so you can retain logging about your app's own cache events:

Or... you can filter out Statamic's cache keys:

use Illuminate\Support\Str;
use Laravel\Nightwatch\Facades\Nightwatch;
use Laravel\Nightwatch\Records\CacheEvent;

Nightwatch::rejectCacheEvents(function (CacheEvent $cacheEvent) {
    return Str::startsWith($cacheEvent->key, 'stache::'); 
});

^ Not all cache events start with stache:: so we'd likely want to improve this snippet before documenting.

You may also want to reject Statamic's HandleEntrySchedule job from being sent to Nightwatch as it is executed every minute:

Nightwatch::rejectQueuedJobs(function (QueuedJob $job): bool {
    return $job->name === \Statamic\Jobs\HandleEntrySchedule::class;
});

When we add the Nightwatch guide, we should link to it from the Debugging page.