[Emails] Adapt automated "paper published" email depending on journal and submission path
The notification email we send authors when their paper is published says: "To facilitate dissemination of your paper, we will also automatically update the arXiv Journal-ref with this information (this update usually takes place within one week; you do not need to take action)." This statement is also added to papers submitted via SciPost's preprint server, for which we do not have the arXiv data and therefore we are unable to fulfill this promise. Even worse, the email says the same for all papers regardless of the journal, even if e.g. Migration Politics doesn't (and can't) use arXiv, or if a chemistry paper didn't use arXiv but ChemRxiv.
The email should be adapted depending on the submission path used for the paper. The promise should be removed for any paper not submitted via arXiv.