Upload R buildpack to pivnet
Upload R buildpack to pivnet

- Add property for non-lts products

[#162646469]

Co-authored-by: Chhavi Kankaria <a45f933d80ef78816bcf302f872972e3887e5115@pivotal.io>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci