Remove version number and git commit from all but one file in codegen (#3216)

# Description of Changes

Closes clockworklabs/SpacetimeDBPrivate#1987

# API and ABI breaking changes

This does not affect any APIs but it does affect the code generated

# Expected complexity level and risk

1

# Testing

<!-- Describe any testing you've done, and any testing you'd like your
reviewers to do,
so that you're confident that all the changes work as expected! -->

- [ ] Snap tests

Author: cloutiertyler