[#87976] Reduce error flash to avoid cookie overflows

This originally addressed cookie overflow in order imports, but in the mean time we found that the cookie overflow avoidance code in journal creation wasn't always working. 5781cfe should make cookie overflow with journaling errors a lot less likely, but there's more we could do, like not repeating the same message when several order details fail for the same reason.
On that note, I think it would be valuable to clean up some of the `create_journal_rows!` method so that the override version in NU doesn't duplicate so much of the code of the default.