* Remove obsolete properties and refactor activity evaluation
Refactored activity input and log persistence property evaluation using improved notification handlers. Removed redundant `ActivityState` property and associated serialization logic, ensuring payloads are only serialized when necessary. All changes streamline workflow processing and enhance maintainability.
* Refactor mediator call to inline cancellation token.
Replaced the separate variable for the cancellation token with an inline reference for clarity and reduced redundancy. This simplifies the code without altering functionality.
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