[DOCS][CSPM][8.4] Add KSPM docs for 8.4

[benironside]

Description

the CSPM team is introducing KSPM capabilities in 8.4. These include a new integration ("Kubernetes Security Posture Management"), a new dashboard ("Cloud posture"), a new top-level page called "Findings", and a new page under Manage called "Benchmarks". This issue is to document the new pages, the new integration, and how to deploy the daemonset that collects kubernetes data to populate the new pages.

The documentation plan / outline is here

Acceptance Test Criteria

Docs PRs have Tinsae's sign-off, and maybe sign-off from other folks in the Cloud Security team.

Sub-issues

#2271
#2272
#2273
#2274