Add unit tests for recommendation engine cost calculations

[wipheg]

Summary

• Add table-driven unit tests for recommendation savings calculations.
• Add mock repositories to test recommendation generation without DB or external API calls.
• Cover rightsizing, idle resource, AWS-account generation, non-AWS skipping, and repository error scenarios.
• Refactor recommendation engine dependencies behind small interfaces to make the logic testable.

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Project	Deployment	Actions	Updated (UTC)
cloud-cost-optimization-hub	Ready	Preview, Comment	Jul 13, 2026 9:43pm
cloud-cost-optimization-hub-vayi	Ready	Preview, Comment	Jul 13, 2026 9:43pm