fix: Remove library version from test headers

[muncus]

This checksum creates diffs on every test file, on every generator run (e.g. #173 ). This makes it hard to spot the substantial changes.

Removing this for now to make reviewing these prs simpler.

part of #168

[grayside]

There is a standard around including tooling versioning, but removing this until we have smarter versioning makes sense.