Sync eng/common directory with azure-sdk-tools for PR 2035 (#15635)
Sync eng/common directory with azure-sdk-tools for PR 2035 (#15635)

* Add

* Add more description to docs of where the variable is consumed

Co-authored-by: Daniel Jurek <ef5be98d5567382bd5b0c07f3c661a000bbfb4dd@microsoft.com>
Azure/azure-sdk-for-go,Azure/azure-sdk-for-go,Azure/azure-sdk-for-go,Azure/azure-sdk-for-go