Honeydew unit tests

Execution

Below commands run all Honeydew unit tests:

# Configure to build Fuchsia on core.x64 along with Honeydew unit tests
fx set core.x64 --with-host //src/testing/end_to_end/honeydew/tests/unit_tests:tests

# Run the Honeydew unit test
fx test //src/testing/end_to_end/honeydew/tests/unit_tests --host --output