DownloadPackage doesn't support latest version

[evertonmc]

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Question, Bug, or Feature?
Type: Feature

Enter Task Name: DownloadPackage

• Server - Azure Pipelines or TFS on-premises?
  Azure DevOps Server 2019.1.1

Issue Description

DownloadPackage doesn't support selecting the latest package at runtime

[lucianiz]

DownloadPackage doesn't support latest version for universal packages.
There is a check

  if (packageType === "upack") {
            return await downloadUniversalPackage(downloadPath, feed.projectId, feed.feedId, packageId, version, filesPattern);
        }

that is done before checking if version = "latest", this causes "latest" version to work for all package types except universal packages, we are using universal packages only, we really need this feature, currently I'm doing workarounds for linux but we now have windows deployments that would require duplicating the workarounds for all windows piplines.

@herenhuang would it be possible to re-open this issue?