Review our Github repo strategy

[seanprivett]

Update existing ADR for strategy of how we want our repository structure to work.
Share this proposal with wider Data Platform team and gain agreement.
This includes a team session to agree
Comparisons with existing monorepo approach

For discussion in DP architecture meeting Tuesday 6th Feb

[MatMoore]

I've gathered list of repos, teams, and workflow automations in this doc, so we can review together in the meeting https://docs.google.com/document/d/1kiH3dzCKq6g9dUFOv84OSior208RcLY5N4BgZ-7NhHA/edit

[MatMoore]

Meeting notes & actions: https://docs.google.com/document/d/18Hw0pMYuVls5Up9659p9Wqqs5lFO93vgo-jI00Oq1xE/edit#heading=h.bsmwqs10mdr

[github-actions]

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