Add warning emoji to fetch warning email subject
Closes part of #509 (closed)
What does this MR do?
Adds a warning emoji to the fetch warning email subject.
How confident are you it won't break things if deployed?
Should not break anything. But there are some email subjects missing, I guess. Probably they do not exist as emailTemplates and I'm too unexperienced into the code base to find them.
Links to related issues
Edited by Chris Oelmueller