Refactor ValueEvaluation handling and improve expected value assignment

- Updated the copy constructor of ValueEvaluation to remove unnecessary 'return scope' qualifier.
- Simplified expected value assignment in EvaluatorContextMethods by directly using the evaluation result.
- Enhanced the handling of expected values in the truncateForMessage and setExpectedValue methods to streamline meta data management.
- Changed function signatures in containmessages.d to pass ValueEvaluation by reference for efficiency.

Author: gedaiu