Pass StatementGuid instead of EntityId objects into the following:
- AssertStatementSubjectExists::execute() use case step
- GetLatestStatementSubjectRevisionMetadata::execute() use case step
- StatementSubjectRevisionMetaDataRetriever::getLatestRevisionMetadata() interface and implementation
Requires T343442: 🍫️ Create subject specific statement use case wrappers to be completed first.