Remove test configurations in `tests/resources`?

[dougiesquire]

As suggested by @aidanheerdegen, we could remove the test configurations in tests/resources and instead clone a specific tag from the relevant config at test time. One disadvantage of doing this is that the tests then would require internet access.

[jo-basevi]

I think I initially added it in fixed test resources as there wasn't a released configuration tag that passed the QA tests at the time. As more QA tests get added, older tags will break - but then maybe it's good having that visibility and also motivation to have at least one tag (or commit if there isn't released tag) that is passing all the tests in each repository so configurations are maintained.. It will also be easier to configure testing multiple configurations