Nuget build reconstruction - Repo root build

[JanKrivanek]

Background

More details in #8510

Based on #8475 create prototype of reconstructing nuget build based on running the donet build on repo root (or pssibly trying to discover some common build script like build.cmd, build.ps1, build.cake etc).

Expected output

Prototype pluggable to #8510

[JanKrivanek]

Implementation: https://github.com/JanKrivanek/PackagesSandbox/tree/main/prototypes/NugetExperiments
Results summarization: OneNote [internal]