* Enable using a live CoreCLR build when building core-setup by passing a path to a CoreCLR product directory via /p:CoreCLROverridePath.

* Enable using a live CoreFX build for Core-Setup restore.

* Grab ucrt redist from CoreCLR output directory.

* Fix overriding long-name DAC on CoreCLR-live build.

* Don't add non-existent doc files to the list of doc files to package.

* Add documentation about how to build with a local coreclr or corefx.

* PR Feedback.

* Extract out the overrides to a local targets file for the netcoreapp shared framework restore. Call out in the documentation of this build feature that it is only supported for the NETCoreApp shared framework.

* Update src/pkg/projects/netcoreapp/src/localnetcoreapp.override.targets
Co-Authored-By: NDavis Goodin <dagood@users.noreply.github.com>


Commit migrated from https://github.com/dotnet/core-setup/commit/b903a6e815dbcec7acfeef39db1e9189fef7ed69