Update MSBuild.exe to set interactive for interactive user sessions

[baronfel]

No description provided.

[rainersigwald]

Concerns to look out for:

• It's kinda hard to detect interactive user sessions in a bulletproof way
• We really, really don't want to accidentally set --interactive for CI/PR/remote/server builds, because that manifests as "hard-to-diagnose build hang".

[baronfel]

Agree. Critical to all of this is the ability for a user to force the interactive-ed-ness to off, which can always be done by explicitly specifying /interactive:false or equivalent.

[KalleOlaviNiemitalo]

/interactive:false can be difficult to add when MSBuild is only invoked by a third-party NPM package as part of a larger node.js build. Is there an environment variable to force noninteractive?