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Extract the multi-backend test harness as a pytest plugin #3414

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@adamtheturtle

tests/backend_harness.py, added in #3413, holds the generic mechanics for running one test suite against several interchangeable backends: a --skip-<backend> option per backend, parametrize IDs, and setup. It knows nothing about Vuforia and does not import from mock_vws, so extracting it should be a move rather than a rewrite.

Running the same suite against a real service, an in-memory fake, and that fake behind HTTP is how a fake is kept honest, and nothing on PyPI packages the pattern.

Before it can move out:

  • It has no tests of its own. It is currently covered only indirectly, through the Vuforia suite.
  • It is a helper library, not a plugin. A real plugin would own the pytest_addoption hook itself and probably offer a fixture factory, rather than leaving each project to write its own fixtures. That shape should be designed against a second consumer rather than guessed at now.
  • --skip-docker_build_tests and its pytest_collection_modifyitems hook stayed behind in tests/mock_vws/fixtures/vuforia_backends.py, because they are about Docker builds rather than backends. "Skip tests carrying marker X via an option" is a related generic idea which may belong in the same package.

Closing this means the module moves to its own package and this repository depends on it.

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