MSBuild Server - Agreeing and achieving desirable usage mode

[JanKrivanek]

Context

MSBuild server is currently opt-in. There might be scenarios where it might bring performance gains. There as well might be possibility to further leverage MSBuild Server (though there is a overlap with current VS build caching techniques). The value and trade-off might not be fully clear

Goal

• Collect feedback from stakeholders (PM/EM), suggest the path forward (if any) and secure stakeholders buy-in for those
• If needed actions are identified - start properly tracking and prioritizing those

Blockers

• NuGet.Build.Tasks caches CredentialProvider device flow timeout. NuGet/Home#12540
• Server: Flush console output periodically #10231

[baronfel]

One of the reasons it's off by default is a known issue with the NuGet credential providers used in Restore - which has been fixed as of a couple weeks ago! We should be clear to pick this effort back up now.