Add the :geo tag to Geo specs

Geo specs should not run under MySQL

ee/spec/models/geo_node_spec.rb

 require 'spec_helper'
 
-describe GeoNode, type: :model do
+describe GeoNode, :geo, type: :model  do
   using RSpec::Parameterized::TableSyntax
   include ::EE::GeoHelpers
 

ee/spec/workers/geo/repositories_clean_up_worker_spec.rb

 require 'spec_helper'
 
-describe Geo::RepositoriesCleanUpWorker do
+describe Geo::RepositoriesCleanUpWorker, :geo do
   include ::EE::GeoHelpers
   include ExclusiveLeaseHelpers
 

ee/spec/workers/geo/repository_cleanup_worker_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Geo::RepositoryCleanupWorker do
+describe Geo::RepositoryCleanupWorker, :geo do
   include ::EE::GeoHelpers
 
   describe '#perform' do