feat: special codegen for void types

[THEjacob1000]

Internal change only

Better handle void return types

Submitter Checklist

Check only those that apply to this change.

• Self-reviewed code, removed extraneous comments, debug logging, checked code style
• No change to users after merge (off-by-default configuration, feature flag, alt URL, etc.) and can be disabled if issues arise (if this is not the case we may need stakeholder signoff)
• Changes are documented (README, wiki, etc)
• Automated tests added or existing tests cover the new functionality or changes
• Manually tested changes
• Metrics added to track the usage/performance
• I am confident I can revert this change
• Database migrations are reversible without data loss (if applicable)
• Performance impact is acceptable (if applicable)
• Any new dependencies are justified or have been approved (if applicable)
• This is NOT a high risk change (if it is, please follow the high-risk change process)

Testing Evidence

What evidence supports that you have tested this change?

• Test cases cover the new functionality or changes
• Screenshots or logs of the changes (if applicable)
• Performance benchmarks (if applicable)
• Storybook cases (if applicable)

Reviewer Checklist

Note: if this PR affects authentication or payments please seek a secondary tester.

• I am ok with code style and functionality
• I have personally tested the feature
• My review was not rushed due to time constraints