Remove DB checks from Geo secondary check in user routes

Catalin Irimierequested to merge
cat-geo-db-connection-in-routes into master

What does this MR do and why?

We need to know whether the current site is a secondary or not to set the default Devise routes (that the app uses to redirect, create paths to etc).

Previously, this used the general check of GeoNode.exists? and verified that the current_node in the database has the secondary flag.

However, this ran queries in initializers, and we disallow that as it won't work for upgrading to Rails 7 either.

This now uses the geo_database_configured? check, on non-Geo nodes or Geo primaries, this should not exist, as there is no tracking DB and Omnibus / CNG don't add this config, while they add it for Geo secondaries.

Related to #359913 (closed)

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