Optimise keyset pagination for audit events

Harsimar Sandhurequested to merge
493723-optimise-audit-events-read into master

What does this MR do and why?

Optimise keyset pagination for audit events

This commit add created_at to keyset ordering to enable partition pruning

EE: true

References

Query:

https://console.postgres.ai/gitlab/gitlab-production-main/sessions/45220/commands/138706

How to set up and validate locally

MR acceptance checklist

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Related to #493723

Edited by Harsimar Sandhu

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