Layout native test components correctly on unix (dotnet/coreclr#19918)

Layout native test components correctly on unix (dotnet/coreclr#19918)

* Enable native test build and add skipmanaged

* Fix adding native components to test dir

* Clean pri1/pri0 builds with native lib copy

This change disables the build of several tests which have native
dependencies; however, would not build the native dependencies on
unix. At copy time this would result in a build-test failure. In
addition, it fixes, adding executables and dynamic/static libraries
to the test's location.

It has been tested with build-test.sh priority1.

* Fix comment wording

* Remove buildagainstpackage arg

* Fix default clang version

* Clean pri1 run OSX

* Correct test count on unix

* Address typo

* Merge runtest.proj

Commit migrated from https://github.com/dotnet/coreclr/commit/d47162260d4e202bb06fcc7449fadbfd2955b83b