Enhance decision workflow with new components and logic

- Updated `WorkflowAccordion` to include new decision-making steps and improved state management.
- Introduced `WorkflowAccordionComponents` for better separation of concerns and reusability.
- Added constants for step descriptions and style classes to streamline component styling.
- Integrated stakeholder selection and decision method handling into the workflow.
- Updated `Decision` model to reflect new workflow structure, including the addition of the 'stakeholders' step.

This commit aims to make the decision-making process feel less like a jigsaw puzzle and more like a well-orchestrated performance.

Author: mrdavidlaing-mo