Security requirements on Cells Observability Blueprint

What does this MR do and why?

This is a follow-up on the discussion on this issue https://gitlab.com/gitlab-org/core-platform-section/data-stores/-/issues/87 Adding a reference to Osquery and Wiz agents and a non-exhaustive list of logs to send to the SIEM.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

doc/architecture/blueprints/cells/infrastructure/observability.md

@@ -55,7 +55,7 @@ the [Cells 1.0](../iterations/cells-1.0.md) iteration.
    1. Error budget metrics.
    1. SIRT: Logs delivery to Devo (e.g. Application Logs, Syslogs, Cloud & Infrastructure Audit logs)
    1. Osquery on VMs
-   2. Wiz Runtime Agent on all VMs & Kubernetes nodes
+   1. Wiz Runtime Agent on all VMs & Kubernetes nodes
 
 1. Cell metrics configuration uses defaults based on the architecture
    and expected workload of the Cell. This is part of the