cmd/goal: refactor to use typeparam

[cuiweixie]

Summary

This PR refactors the helpList function to use Go generics (type parameters) instead of interface{} casting, improving type safety and simplifying the calling code.

Converts helpList function to use generic type parameter V appInteractDatum
Removes manual map copying in EntryList() and ProcList() methods
Eliminates redundant type casting by leveraging generics

Test Plan

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[Copilot]

Pull Request Overview

This PR refactors the helpList function to use Go generics (type parameters) instead of interface{} casting, improving type safety and simplifying the calling code.

• Converts helpList function to use generic type parameter V appInteractDatum
• Removes manual map copying in EntryList() and ProcList() methods
• Eliminates redundant type casting by leveraging generics

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[jannotti]

I suppose this is fine, but it amounts to a small optimization (at the expense of code size) for an almost never used feature (interact) that I'd just as soon delete entirely.