Update labels used for direction pages

As the direction label is not consistently used on issues or epics, this MR updates the labels used for filtering to the new labels being used as part of the product and engineering interlock and roadmapping process.

Additionally, this MR hides empty stages and milestones, and adds missing stages.

Part of Product#14015

Review app link: https://labels-14015.about.gitlab-review.app/upcoming-releases/

Before	After