Better error message to when platform has timeouts

[devvit-help-bot[bot]]

Details

I got "Error: GetSubredditInfoByName HTTP error 504: Gateway Timeout" during my second attempt uploading, and then back to 503 in my third attempt.

Additional info

Discord message: These things could be useful to have noted in devvit itself when the errors occur, like a “looks like an error on our end” message to save devs thinking it’s a change they made in the code

Message author: xenc.

Discord link: https://discord.com/channels/1050224141732687912/1050227353311248404/1292846876252442715