Enabling Policheck for Runtime repo

[Anipik]

I am trying to enable the policheck for the runtime repo here dotnet/runtime#33841

Policheck doesnot uses any artifacts, there is no way to disable the downloading of the artifacts.
It seems like after the consolidation of the repos the number of artifacts has increased a lot which is
leading the powershell being crashed while trying to extract files.

https://dev.azure.com/dnceng/internal/_build/results?buildId=570237

This issue is currently blocking enabling of policheck for the runtime repo.

cc @sunandabalu @ericstj

[sunandabalu]

As a short-term fix to unblock runtime to enable SDL runs, we should make the Download and there by extraction of artifacts optional. This should be a easy fix to plumb through.

Long-term we do need to address the StackOverFlow issue with powershell trying to extract BlobArtifacts.

\cc @ilyas1974