Fix S3 adapter retrying failing uploads with exponential backoff (#12085)

The default limit of 10 retries with exponential backoff meant
that if the S3 server was timing out, you would be stuck with it
for much, much longer than the 5 second read timeout we expect.

The uploading happens within a database transaction, which means
a failing S3 server could negatively affect database performance

config/initializers/paperclip.rb

@@ -40,6 +40,7 @@ if ENV['S3_ENABLED'] == 'true'
       http_open_timeout: 5,
       http_read_timeout: 5,
       http_idle_timeout: 5,
+      retry_limit: 0,
     }
   )