chore: Refactoring for single source of args truth

[yhakbar]

Description

Fixes #000.

TODOs

Read the Gruntwork contribution guidelines.

• I authored this code entirely myself
• I am submitting code based on open source software (e.g. MIT, MPL-2.0, Apache)]
• I am adding or upgrading a dependency or adapted code and confirm it has a compatible open source license
• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added / Removed / Updated [X].

Migration Guide

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Project	Deployment	Review	Updated (UTC)
terragrunt-docs	Ready	Preview, Comment	Jan 6, 2026 6:16pm

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