docs(terraform): comprehensive state & modules Q&A with best practices, examples, and cheatsheet

[fdaniel-alvarez-dev]

This contribution adds a detailed Q&A and best-practices guide for managing and upgrading Terraform state and modules.

Key highlights:

• Clear explanations on safe state moves and refactoring workflows.
• Practical examples of moved blocks and provider version upgrades.
• Common pitfalls, rollback strategies, and prevention tips.
• Includes a concise cheatsheet for quick reference.
• Complements PR Added Terraform state explanation and improved module section #10607 by expanding Terraform knowledge coverage.

All content follows the existing format and conventions from the repository’s documentation.
Validated for clarity, syntax, and Markdown structure.

[betilenestevesylvanostevesylva-create]

Hi

[fdaniel-alvarez-dev]

Hi Ari, as the repo owner, thanks for checking out this PR—it's packed with practical guides on Terraform states and modules, plus examples, all to boost the repo's docs.
I'd love your feedback to refine it further! 😊