Do not filter out integrations without properties

These are ignored in the background migration itself, so we don't
need to also filter them at the batching stage.

db/post_migrate/20220204194347_encrypt_integration_properties.rb

@@ -7,10 +7,8 @@ class EncryptIntegrationProperties < Gitlab::Database::Migration[1.0]
   INTERVAL = 2.minutes.to_i
 
   def up
-    requiring_update = define_batchable_model('integrations').where.not(properties: nil)
-
     queue_background_migration_jobs_by_range_at_intervals(
-      requiring_update,
+      define_batchable_model('integrations'),
       MIGRATION,
       INTERVAL,
       track_jobs: true,