Sort welcome emails by user_id

This allows the test test_invalid_email_address_skips_invalid
to have a deterministic logger sequence.

emails/management/commands/send_welcome_emails.py

@@ -26,7 +26,7 @@ class Command(BaseCommand):
         logger.info("Starting send_welcome_emails")
         profiles_without_welcome_email = Profile.objects.filter(
             sent_welcome_email=False
-        )
+        ).order_by("user_id")
         emails_to_send = len(profiles_without_welcome_email)
         logger.info(f"Emails to send: {emails_to_send}")
         for profile in profiles_without_welcome_email: