* Build and Packaging Improvements

<details>

<ul>
<li>Fix Azure file copy issues in release build by fixing the path to upload directory content (#13182)</li>
<li>Update .NET Core to version 2.1.808 (Internal 12003)</li>
<li>Fix Azure file copy break in AzDevOps by updating task version to latest (#13173)</li>
</ul>

</details>