Before these checks would always check Redis once per request, and the
Redis key had a timeout of 15 seconds. However, this polling can add
significant load to the Redis server. Instead, revise the caching
strategy instead to the following:

* L1 cache (thead-local, memory store): 1 minute
* L2 cache (Redis): 2 minutes

The downside is cache invalidation: it will take up to 2 minutes for any
changes in the Geo nodes to propagate to a secondary.

Relates to https://gitlab.com/gitlab-com/gl-infra/production/issues/928

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/12591