Allowlist a finder method

app/finders/ci/pipelines_for_merge_request_finder.rb

@@ -42,6 +42,8 @@ module Ci
               triggered_for_branch.for_sha(commit_shas)
             end
 
+          pipelines = pipelines.allow_cross_joins_across_databases(url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/336891')
+
           sort(pipelines)
         end
       end

spec/support/database/cross-join-allowlist.yml

@@ -5,7 +5,6 @@
 - "./spec/features/groups/packages_spec.rb"
 - "./spec/features/projects/infrastructure_registry_spec.rb"
 - "./spec/features/projects/packages_spec.rb"
-- "./spec/finders/ci/pipelines_for_merge_request_finder_spec.rb"
 - "./spec/lib/api/entities/package_spec.rb"
 - "./spec/lib/gitlab/background_migration/copy_ci_builds_columns_to_security_scans_spec.rb"
 - "./spec/lib/gitlab/background_migration/migrate_pages_metadata_spec.rb"