Add smaller test and debug improvements

[wulfraem]

Description of change

Adds some smaller improvements to output during tests, and fixes a smaller issue with build:

• npm run build now runs without errors on macOS again, as fix_docs now works as expected on macOS
• IOTA server logs from CI can now been downloaded (--> "Archive server logs" step)
• identity_iota_core/scripts/publish_identity_package.sh script now emits the response if it cannot be parsed, instead of the message that just says, that the JSON could not be parsed
• cli tools error logs in identity_iota_core and the GRPC bindings now all include stderr where a custom error is thrown