Ensure build script works on VS2019-only machine

[xavierdecoster]

Copied the relevant functions from NuGet/NuGet.Client repo.

[joelverhagen]

This works okay on the CI (nuget.visualstudio.com) and release (devdiv.visualstudio.com) agents?

[xavierdecoster]

This works okay on the CI (nuget.visualstudio.com) and release (devdiv.visualstudio.com) agents?

CI for this PR is green (nuget.visualstudio.com). How can I test release agents without releasing this private branch?

[xavierdecoster]

Verified a private branch for NuGetDeployment on the default Agent Pool.

Given the other pipelines run on the same Agent Pool, I don't expect any issues with this change.

I also modified the following build.ps1 files and tested the change locally using commit SHA: b025102b17519474d1921d0c44aac62d15024df9 (which points to the build files in this very PR).

• ServerCommon (this very PR)
• NuGet.Jobs
• Metadata v3 Jobs

Please let me know if I need to perform a specific additional test before merging this PR.

@joelverhagen @ryuyu.

[xavierdecoster]

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