Remove FDW configured check

Since GitLab 13.2 we don't rely on FDW query/models

ee/lib/gitlab/geo/health_check.rb

@@ -12,7 +12,6 @@ module Gitlab
         return 'Geo node has a database that is writable which is an indication it is not configured for replication with the primary node.' unless Gitlab::Database.db_read_only?
         return 'Geo node does not appear to be replicating the database from the primary node.' if replication_enabled? && !replication_working?
         return "Geo database version (#{database_version}) does not match latest migration (#{migration_version}).\nYou may have to run `gitlab-rake geo:db:migrate` as root on the secondary." unless database_migration_version_match?
-        return 'Geo database is not configured to use Foreign Data Wrapper.' unless Gitlab::Geo::Fdw.enabled?
 
         ''
       rescue => e

ee/spec/lib/gitlab/geo/health_check_spec.rb

@@ -102,7 +102,6 @@ RSpec.describe Gitlab::Geo::HealthCheck, :geo do
           context 'that is working' do
             before do
               allow(subject).to receive(:replication_working?).and_return(true)
-              allow(Gitlab::Geo::Fdw).to receive(:enabled?) { true }
             end
 
             it 'returns an error if database is not fully migrated' do
@@ -115,12 +114,6 @@ RSpec.describe Gitlab::Geo::HealthCheck, :geo do
               expect(message).to include('gitlab-rake geo:db:migrate')
             end
 
-            it 'returns an error when FDW is disabled' do
-              allow(Gitlab::Geo::Fdw).to receive(:enabled?) { false }
-
-              expect(subject.perform_checks).to match(/Geo database is not configured to use Foreign Data Wrapper/)
-            end
-
             it 'finally returns an empty string when everything is healthy' do
               expect(subject.perform_checks).to be_blank
             end