Connect Secure File destroy service to Project destroy process

app/services/projects/destroy_service.rb

@@ -200,6 +200,10 @@ module Projects
         ::Ci::DestroyPipelineService.new(project, current_user).execute(pipeline)
       end
 
+      project.secure_files.find_each(batch_size: BATCH_SIZE) do |secure_file| # rubocop: disable CodeReuse/ActiveRecord
+        ::Ci::DestroySecureFileService.new(project, current_user).execute(secure_file)
+      end
+
       deleted_count = ::CommitStatus.for_project(project).delete_all
 
       Gitlab::AppLogger.info(

spec/services/projects/destroy_service_spec.rb

@@ -43,6 +43,7 @@ RSpec.describe Projects::DestroyService, :aggregate_failures, :event_store_publi
       let!(:report_result) { create(:ci_build_report_result, build: build) }
       let!(:pending_state) { create(:ci_build_pending_state, build: build) }
       let!(:pipeline_artifact) { create(:ci_pipeline_artifact, pipeline: pipeline) }
+      let!(:secure_file) { create(:ci_secure_file, project: project) }
 
       it 'deletes build and pipeline related records' do
         expect { destroy_project(project, user, {}) }
@@ -56,6 +57,7 @@ RSpec.describe Projects::DestroyService, :aggregate_failures, :event_store_publi
           .and change { Ci::BuildReportResult.count }.by(-1)
           .and change { Ci::BuildRunnerSession.count }.by(-1)
           .and change { Ci::Pipeline.count }.by(-1)
+          .and change { Ci::SecureFile.count }.by(-1)
       end
 
       it 'avoids N+1 queries' do