It's only available in the Enterprise version, which is well beyond the budget of most.
https://www.visualstudio.com/en-us/news/releasenotes/vs2017-...
https://www.visualstudio.com/en-us/news/releasenotes/vs2017-...
https://partner.microsoft.com/en-AU/membership/msdn-subscrip...
The registration fee is something like $2K.
There are various competencies you need to demonstrate to become a partner, but there's enough diversity between them that most businesses with Microsoft tech somewhere in the stack could become a partner.