Remove legacy wal location

lib/gitlab/database/load_balancing/sidekiq_server_middleware.rb

@@ -67,16 +67,7 @@ module Gitlab
         end
 
         def get_wal_locations(job)
-          job['dedup_wal_locations'] || job['wal_locations'] || legacy_wal_location(job)
-        end
-
-        # Already scheduled jobs could still contain legacy database write location.
-        # TODO: remove this in the next iteration
-        # https://gitlab.com/gitlab-org/gitlab/-/issues/338213
-        def legacy_wal_location(job)
-          wal_location = job['database_write_location'] || job['database_replica_location']
-
-          { ::Gitlab::Database::MAIN_DATABASE_NAME.to_sym => wal_location } if wal_location
+          job['dedup_wal_locations'] || job['wal_locations']
         end
 
         def load_balancing_available?(worker_class)

spec/lib/gitlab/database/load_balancing/sidekiq_server_middleware_spec.rb

@@ -114,19 +114,6 @@ RSpec.describe Gitlab::Database::LoadBalancing::SidekiqServerMiddleware, :clean_
         it_behaves_like 'replica is up to date', 'replica'
       end
 
-      context 'when legacy wal location is set' do
-        let(:job) { { 'job_id' => 'a180b47c-3fd6-41b8-81e9-34da61c3400e', 'database_write_location' => '0/D525E3A8' } }
-
-        before do
-          allow(ActiveRecord::Base.load_balancer)
-            .to receive(:select_up_to_date_host)
-            .with('0/D525E3A8')
-            .and_return(true)
-        end
-
-        it_behaves_like 'replica is up to date', 'replica'
-      end
-
       context 'when database location is not set' do
         let(:job) { { 'job_id' => 'a180b47c-3fd6-41b8-81e9-34da61c3400e' } }