Add architecture blueprint for Security policies database read model
What does this MR do and why?
This MR adds the architectural blueprint for Use database read model for merge request appr... (&9971).
It's based on the proposal from Draft: Security policy read model architecture (!117748 - closed) and converted into the structure prescribed by the architectural blueprint template.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #433410 (closed)
Edited by Martin Čavoj