Comment 6 for bug 1667080

Here are the flowroute related commits for this feature to add it to 3_11

https://gitlab.com/LARL/evergreen-larl/-/commits/rel_3_11_0-larl?search=flowroute

I think there are some other bits somewhere having to do with hiding the sms_carrier, but also always including a default value for it since it is required to be non null to place a hold.

Josh