Add a way to run Unit Tests (#679)

Add a way to run Unit Tests (#679)

* Add googletest as Testing Framework

* Add test infrastructure; add OPENKO_BUILD_TESTS flag to CMake.

* build_cmake_server.yml: Run tests with ctest.

* MSBuild: Add test-related projects

* build_msbuild_all.yml: Build & run tests.

* GitHub workflows: we shouldn't need ${{env.GITHUB_WORKSPACE}} at all; the path is relative to the repository so it should be fine.

* Add GTA.runsettings for faster exposure

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Co-authored-by: twostars <i.am.twostars@gmail.com>

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