Update E2E test report and enhance drift analysis handling
- Updated the E2E test report metrics to reflect the latest test results, showing 47 collected tests with all passing.
- Removed outdated sections related to failed tests and their causes, streamlining the report.
- Implemented a regression fix in the drift analysis to handle empty merged frames, ensuring workflows skip export when no drift metrics are available.
- Enhanced the `insert_sample_data` and `insert_sample_prediction` functions to allow customizable timestamps for better test accuracy.
- Refactored E2E tests to improve clarity and maintainability, particularly in handling repeat scenarios with distinct timestamps.
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