Decrease CI output verbosity
Some tests with small errors fail with:
The job exceeded the maximum log length, and has been terminated. because the generated rust files are a single line, so the error trace is the entire generated file.
i think this could be remedied by adding a cargo fmt pass here, or by teaching svd2rust to format created files as part of the process.
rustfmt was removed in #269 due to slow build time. I don't think it improved performance too much though. https://github.com/rust-embedded/svd2rust/pull/269#issuecomment-448166840_ is something I would like to see implemented however.
My suggestion would be to only format crates that fail (which can be done both in svd2rust-regress and the sh script).