Terraform Docs: Updates for dynamic module sources

[dbanck]

What

This PR updates the documentation around module source and version attributes. Starting with Terraform 1.15 they now can be an expression that references variables and locals.

As soon as someone starts using dynamic module sources, Terraform will need values for these variables to load the full configuration. Because of that, most commands now accept variables via the CLI.

Why

Terraform 1.15 will ship with dynamic module sources and versions.

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Merge Checklist

If items do not apply to your changes, add (N/A) and mark them as complete.

Pull Request

• Implement dynamic module sources terraform#38217
• Add variables to all commands that load configuration terraform#38276

Content

• You added redirects to content/terraform-docs-common/redirects.jsonc for moved, renamed, or deleted pages across all affected versions. Refer to Redirects for examples and guidance.
• Links to related content where appropriate (e.g., CLI, language, API endpoints, permissions, etc.).
• Pages with related content are updated and link to this content when appropriate.
• Sidebar navigation files have been updated for added, deleted, reordered, or renamed pages.
• New pages have metadata (page name and description) at the top.
• New images are 2048 px wide. They have HashiCorp standard annotation color (#F92672) and format (rectangle with rounded corners), blurred sensitive details (e.g. credentials, usernames, user icons), and descriptive alt text in the markdown for accessibility.
• New code blocks have the correct syntax and line breaks to eliminate horizontal scroll bars.
• UI elements (button names, page names, etc.) are bolded.
• The Vercel website preview successfully deployed.

Reviews

• I or someone else reviewed the content for technical accuracy.
• I or someone else reviewed the content for typos, punctuation, spelling, and grammar.

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