* WIP add interop tests

* Clean up

* Move test project into build infrastructure

* Clean up

* Remove hardcoded paths

* Clean up

* Fix build

* Add copyright notices

* Update azure template

* Fix build

* Fix build?

* Fix build?

* Add gRPC interop tests to CI

- Convert to using references managed by build infrastructure
- Use produced AspNetCore.App shared framework
- Save server logs
- Dynamically bind to ports
- Ensure InteropWebsite is built in the same configuration as the test project

* Cleanup

* Rebase fix

* Include tests assets in build directory for Helix

* Incorporate changes in ProcessEx

* Include Grpc test in regular build

* Fixup

* Test

* exe doesn't always exist

* Capture logs on helix

* Maybe this will work

* There are two application started messages

* Derp

* Cleanup

* Update directory

* Add interop tests to more pipelines

* mkdir

Co-authored-by: John Luo <johluo@microsoft.com>