Remove legacy queries methods from Gitlab::Geo::Fdw

ee/lib/gitlab/geo/fdw.rb

@@ -23,10 +23,6 @@ module Gitlab
           !enabled?
         end
 
-        def enabled_for_selective_sync?
-          enabled? && Feature.enabled?(:use_fdw_queries_for_selective_sync, default_enabled: true)
-        end
-
         # Return full table name with foreign schema
         #
         # @param [String] table_name

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

@@ -99,40 +99,6 @@ describe Gitlab::Geo::Fdw, :geo do
     end
   end
 
-  describe '.enabled_for_selective_sync?' do
-    context 'when the feature flag is enabled' do
-      before do
-        stub_feature_flags(use_fdw_queries_for_selective_sync: true)
-      end
-
-      it 'returns false when FDW is disabled' do
-        allow(described_class).to receive(:enabled?).and_return(false)
-
-        expect(described_class.enabled_for_selective_sync?).to eq false
-      end
-
-      it 'returns true when FDW is enabled' do
-        expect(described_class.enabled_for_selective_sync?).to eq true
-      end
-    end
-
-    context 'when the feature flag is disabled' do
-      before do
-        stub_feature_flags(use_fdw_queries_for_selective_sync: false)
-      end
-
-      it 'returns false when FDW is disabled' do
-        allow(described_class).to receive(:enabled?).and_return(false)
-
-        expect(described_class.enabled_for_selective_sync?).to eq false
-      end
-
-      it 'returns false when FDW is enabled' do
-        expect(described_class.enabled_for_selective_sync?).to eq false
-      end
-    end
-  end
-
   describe '.foreign_tables_up_to_date?' do
     it 'returns false when foreign schema does not exist' do
       drop_foreign_schema