Minor refactoring tasks for v-next

[antico5]

This PR addresses some minor refactorings:

• Removing redundant v-next/hardhat/src/internal/cli/init/constants.ts
• Rename cli help's helper files to match kebab-case
• Rename cli/helpers to cli/help since it only contains helpers for the help task, to be consistent with the init task.

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Latest commit: 8cee837

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 13, 2024 0:29am

[schaable]

LGTM!