Run the hook also for test runs

[aepfli]

We're adopting this hook instead of checked-in generated protobuf files, which works great. The big downside is that we have to run hatch build before we can run any tests, as the generation is bound to the build target.

Although this seems more like a limitation from Hatch, I wonder if there is a recommendation from this hook on how to achieve this best.

Thank you

PS: great tool. Thank you