Redo #224 which failed internal build

[zsd4yr]

#546 was incorrect

[Tanya-Solyanik]

Could you please explain what was incorrect and how you fixed it? Also how would you prove that this PR is correct?

[zsd4yr]

Could you please explain what was incorrect and how you fixed it? Also how would you prove that this PR is correct?

I am going to perform a build in the internal build system and link the results here to prove the issue is fixed.

basically the issue was that a public build requires:

1. a Creator (for us this is our repository name: dotnet/winforms
2. helix token to be empty ''

while an internal build requires:

1. the Creator to be empty ''
2. helix token to be a valid dotnet api helix token

and neither of the two parts for an internal build were satisfied. I wasn't aware of this until an internal build failed, so now I am going to validate with an internal build (which is a little tricky to do, but I'll get it done with some git magic)

[zsd4yr]

internal build has passed on same bit: https://dnceng.visualstudio.com/internal/_build/results?buildId=119029

[JuditRose]

Lgtm