Make test part of the build and release workflow. Run tests on all branches.

[bernheder]

I think the test job should be part of both the build and release workflows, as the package should only be built and released if it functions correctly.

Furthermore, since the test job is then part of the build/release process and consistently runs on the same trigger as the build workflow (push/pull requests to the main branch), it can either be removed or, in this case, modified to run in different scenarios (I would suggest running tests on all branches).

[grst]

I don't think we need this...

• tests already run on all branches for which a pull request exists (and a pull request is the only way to get something in the main branch)
• anything in the main branch needed to pass the tests to get in, so we don't need to rerun them on release.