Re-enable GeoIP filter for configs testing

## Description

We ended up excluding the GeoIP filter i.e. `root/configuration/http/http_filters/_include/geoip-filter.yaml` config as part of the examples build as it was crashing. We suspected that the `example_configs_test` is using mock environments that probably don't support the filesystem watchers and background threads.

The GeoIP provider creates a dedicated thread for watching MaxMind's DB file changes and the crash seems to be happening when the GeoIP provider is trying to create its background file-watcher thread.

This issue is to track the fix for `example_configs_test` and remove it from the exclusion list once we get it to work.

cc @phlax