Fix and improve batch attachment deletion handling when using OpenStack Swift (#32637)

app/lib/attachment_batch.rb

@@ -76,10 +76,22 @@ class AttachmentBatch
           when :fog
             logger.debug { "Deleting #{attachment.path(style)}" }
 
+            retries = 0
             begin
               attachment.send(:directory).files.new(key: attachment.path(style)).destroy
-            rescue Fog::Storage::OpenStack::NotFound
-              # Ignore failure to delete a file that has already been deleted
+            rescue Fog::OpenStack::Storage::NotFound
+              logger.debug "Will ignore because file is not found #{attachment.path(style)}"
+            rescue => e
+              retries += 1
+
+              if retries < MAX_RETRY
+                logger.debug "Retry #{retries}/#{MAX_RETRY} after #{e.message}"
+                sleep 2**retries
+                retry
+              else
+                logger.error "Batch deletion from fog failed after #{e.message}"
+                raise e
+              end
             end
           when :azure
             logger.debug { "Deleting #{attachment.path(style)}" }