[ECOM-423] Add `SoapOrderHeaderService`
This PR adds the SoapOrderHeaderService
using the new WSDL provided by @lloyd-carter.
Please review: @ahoffmann @weizhong-wang @lloyd-carter
At 10PM on Tuesday, 3/4/25, GitLab will be patched to version 17.8.4: https://outages.doit.wisc.edu/outage/94b93a4e9afac6453b4ca146bbb5a427c6856c676f
This PR adds the SoapOrderHeaderService
using the new WSDL provided by @lloyd-carter.
Please review: @ahoffmann @weizhong-wang @lloyd-carter