Refactor tv-board-zoom mutation handling and improve cache invalidation logic

- Introduced new utility functions for node connectivity and containment checks.
- Enhanced mutation reaction logic to differentiate between semantic churn and structural changes.
- Updated shouldScheduleTvBoardZoomMutation to utilize the new mutation reaction function.
- Added tests to verify correct scheduling behavior for semantic and structural mutations without unnecessary cache invalidation.
- Cleaned up redundant code and improved readability in mutation handling functions.

Author: thomasasen