build: do not try to run non existent VSTS release builds (#20875)

script/ci-release-build.js

@@ -215,7 +215,6 @@ function runRelease (targetBranch, options) {
   } else {
     buildCircleCI(targetBranch, options)
     buildAppVeyor(targetBranch, options)
-    buildVSTS(targetBranch, options)
   }
 }