refactor(ast_codegen): flatten code

[overlookmotel]

A bit of code style simplification after #4731. Remove unnecessary nesting and rename some vars for consistency.

[overlookmotel]

• refactor(ast_codegen): flatten code #4743 👈
• main

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[rzvxa]

I didn't add a merge label so #4737 goes through, I'm afraid that stack's madness might cause issues in the merge queue.

[codspeed-hq]

CodSpeed Performance Report

Merging #4743 will not alter performance

_{Comparing 08-07-refactor_ast_codegen_flatten_code (f36500a) with main (aeed29f)}

Summary

✅ 29 untouched benchmarks

[graphite-app]

Merge activity

• Aug 7, 6:31 PM EDT: The merge label 'merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Aug 7, 6:31 PM EDT: rzvxa added this pull request to the Graphite merge queue.
• Aug 7, 6:35 PM EDT: rzvxa merged this pull request with the Graphite merge queue.