BuildChecks Dogfooding: Collect info from sample repos

[JanKrivanek]

Context

As part of #10548 we want to invest into dogfooding of buildchecks.
As a first step towards it - we need to proactively run and collect issues and perf impact on some sample repos.

Goals

• Prepare a list of sample repos - ideally 3 bigger ones (e.g. msbuild, roslyn, runtime) and 3 average ones (e.g. templating, debugger-contracts, crank)
• Run build on those on a choosed version - make sure those are clean of errors. Collect 'wall clock time' perf stats for builds
• Run the same builds on same versions of the repos with buildcheck opted in (/check)
  • Collect and log the issues
  • Collect the perfstats
• Evaluate the perf impact and the blocking issues