[STAR-2302, STAR-2504] Revise Business Development, DD, add Value Proposition.

This MR revises Business Development Processes, specifically the sales process. The revisions involve working with the Epic Planning and Sustainability Manager, processes for Client Owners to become more involved in sales, and some significant changes to the Discovery Duty role.

This MR also introduces the Value Proposition Template and processes surrounding its creation and maintenance, and several smaller tweaks.

JIRA tickets: https://tasks.opencraft.com/browse/STAR-2504 https://tasks.opencraft.com/browse/STAR-2302