Windows CoreFX CI (#18365)

Windows CoreFX CI  (#18365)

* Add test list CL switch

* End-To-End Test Run on Windows

* Cleanup

* MAX_PATH Workaround

* Set Execution directory for CoreFX tests

* Add All CoreFX PR Tests

* Add test dependencies

* Add extra dependencies

* Add parallel test execution

* Disable OuterLoop tests and System.Data.SqlClient.*  tests

* Initialize maximum degree of parallelization to Environment.ProcessCount

* Remove unnecessary cli option

* Update Dependencies

* Add "enabled" property to tests

* Remove exclusions due to TestUtilities mismatch

* Add capability to run all tests for running Helix test lists directly

* Refactor build script to build testhost when skipping managed tests

* Disable failing System.Threading.Tests.EventWaitHandleTests.Ctor_InvalidMode

* Add switch to skip native test build

* Add testing documentation

* Don't run tests marked as "disabled" when running all available tests

* Add switch to build only testhost and remove Core_Root_Stage

* Clean up TopN.CoreFX.Windows.issues.json

* Refactor build-test.cmd

* PR feedback - build pipeline and documentation

* PR Feedback - Test Helper headers and comments

* Fix buildtesthost option for only building CoreFX test dependencies

* Disable intermittently failing test DrawBezier_PointFs