🧪 Add test for CatalogSyncReport::error_summary

[edithatogo]

🎯 What: The testing gap addressed
The CatalogSyncReport::error_summary method was previously untested, leaving its string joining functionality unverified.

📊 Coverage: What scenarios are now tested
Added error_summary_formats_errors_correctly which tests:

• An empty error list (expecting an empty string).
• A single error (expecting format "provider: message").
• Multiple errors (expecting format "provider1: message1; provider2: message2").

✨ Result: The improvement in test coverage
The string formatting and joining logic within error_summary is now robustly tested to handle 0, 1, and N error scenarios, ensuring edge cases are properly evaluated and regressions are prevented.

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PR created automatically by Jules for task 6495785222367279021 started by @edithatogo

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