[Improved, Fixed] Kombo performance hotfix

Improvements

• SuccessFactors and other Kombo-based ATS syncs now complete up to 25× faster, so new candidates appear in Classet sooner and the dashboard feels more responsive.
• Lower network traffic and smarter batching greatly reduce the chance of time-outs during large job imports.

Fixes

• Eliminated intermittent 500 errors that some users saw when Classet pulled candidate updates from SuccessFactors.