Add Goose setup tab with OAuth instructions

[hydrosquall]

What does this PR do? What is the motivation?

This PR updates the Goose integration documentation to include a dedicated setup tab with current and accurate instructions. Previously, Goose was grouped with other clients under the "Other" tab with outdated setup guidance.

The changes:

• Add a new "Goose" tab with step-by-step MCP server setup instructions based on the Kiro tab structure
• Direct users to Goose's official "Add an MCP server" documentation
• Include instructions for enabling product-specific tools via the toolsets query parameter
• Clarify that OAuth authentication occurs on first session launch
• Update the supported clients table to give Goose its own row with Agentic AI Foundation as the developer
• Separate Cline into its own row in the supported clients table
• Add Codex CLI link to the supported clients table with reference to OpenAI documentation

This aligns with the user request to modernize the Goose integration instructions and base them on the proven Kiro setup pattern.

Merge instructions

Merge readiness:

• Ready for merge

AI assistance

Used AI assistance for initial draft of the documentation content and structure.

Additional notes

The Goose tab follows the same regional endpoint selection pattern as Kiro and includes appropriate alerts for unsupported regions (gov). The deeplink format and configuration instructions are based on Goose's current extension system. The Codex CLI link has been added to improve documentation completeness for OpenAI users.

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Bits Dev status: ✅ Done

CI Auto-fix: Disabled | Enable

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Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/dd/add-goose-mcp-server-setup-tab/bits_ai/mcp_server/setup