Validate repo auth when linking to workspace

[khaliqgant]

Summary

• validate repo ownership, existing workspace linkage, and GitHub App installation before linking repos to a workspace
• update workspace config repository list when linking

Testing

• not run

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📊 2 files reviewed • 4 need attention

⚠️ Needs Attention:

• deploy/workspace/gh-relay — Improvements to token management and authorization process require careful evaluation due to potential security and logic risks.

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