Add SSOT epic for all Scalability team work

Why is this change being made?

Organising work for teams working across multiple groups and projects is hard. Ensuring the team is focused on long term rather than just short term, I've created the epic that will serve as a single source of truth for teams ongoing work.

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what