docs: Add shadow_link to Terraform provider resource list (DOC-2022)

[Feediver1]

Resolves https://redpandadata.atlassian.net/browse/DOC-2022

Adds shadow_link to the resource list on the Redpanda Terraform provider page, linking to the registry reference. The resource shipped in provider v2.0.0.

Companion docs PR adds Terraform tabs to the single-sourced Configure Shadowing page (create and update sections); that content flows to the cloud-docs stub automatically.

🤖 Generated with Claude Code

Preview pages

• Redpanda Terraform provider (updated: Shadow links added to the resource list)
• What's New in Redpanda Cloud (updated: Terraform provider Shadow link management entry, July 2026 — added for DOC-2395)

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[coderabbitai]

📝 Walkthrough

Walkthrough

The Terraform provider resource list in the manage documentation now includes Shadow links.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: david-yu

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the change: adding shadow_link to the Terraform provider resource list.
Description check	✅ Passed	The description covers the issue, summary, and previews, but it omits the review deadline and checks section from the template.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch DOC-2022-terraform-shadow-link

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