Migration guide update (#5633)

* docs: Add migration tool (MCP server) section to migration guide

Add instructions for installing and configuring the SageMaker SDK
migration MCP server tool. Includes setup for Kiro, Kiro CLI, VS Code
(Cline), Claude Desktop, and Cursor. Documents available tools
(analyze_code, transform_code, validate_code, ask_question), example
usage, and troubleshooting steps.

* docs: Update Feature Store status to supported in migration guide

Feature Store is now supported in V3 via sagemaker.core.resources.FeatureGroup
and FeatureStore. Update the status from REMOVED to SUPPORTED.

* docs(migration): Add Codex CLI, VS Code Copilot, and Roo Code to MCP server IDE setup table

Add configuration locations for additional IDEs that support the
SageMaker migration MCP server: VS Code with Copilot, VS Code with
Roo Code extension, and Codex CLI.

Author: nargokul

migration.md

@@ -48,7 +48,10 @@ Add the following to your MCP configuration file:
 |-----|----------------|
 | Kiro | `~/.kiro/settings/mcp.json` |
 | Kiro CLI | `~/.kiro/settings/mcp.json` |
+| VS Code (Copilot) | `.vscode/mcp.json` in workspace root |
 | VS Code (Cline) | Cline extension settings → MCP Servers |
+| VS Code (Roo Code) | Roo Code extension settings → MCP Servers |
+| Codex CLI | `codex.json` or `~/.codex/config.json` |
 | Claude Desktop | `~/Library/Application Support/Claude/claude_desktop_config.json` (macOS) |
 | Cursor | Settings → MCP section |