Fix flaky HomeController tests: use array cache in test env

[kevindees]

Attempt to fix issues with seeder and caching.

[allella]

@kevindees is CACHE_STORE the more current way (since ~ v11) to set the cache driver?

I had made a note in #741 about updating to the newer keys for the cache and mail drivers and the docs seem to support that we're using older names in our .env files and config/cache.php

https://laravel.com/docs/13.x/cache

[kevindees]

@allella @oliviasculley

Do we want to include a fallback for CACHE_DRIVER or just use CACHE_STORE now? I'm working on the upgrade to CACHE_STORE from CACHE_DRIVER.

[allella]

No strong feelings.

It seems like it's going to default to file for most dev environments because I don't image too many folks are setting up memcache or Redis on dev.

Unless there's something in the Docker setup (defer to @oliviasculley) that's worth keeping CACHE_DRIVER around, then I'd be good with outright replacing it.

I've already updated stage and production was already using CACHE_STORE and defaulting to file.

I figure we can expecting anybody using a fancy cache should be smart enough to look at .env.example and figure it out.