[Internal]: Attack discovery programmatic access guide

### Description

Let's add a page showing how to query AD indices directly, for anyone who wants to set up integrations and also document security considerations for AD integrations. The skill identifies shell injection, KQL injection, markdown injection, and prompt injection risks when working with AD data programmatically.

### Resources

refer to https://github.com/elastic/agent-skills-sandbox/tree/main/skills/security/attack-discovery-triage

### Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

### Feature differences

-

### What release is this request related to?

N/A

### Serverless release

-

### Collaboration model

The documentation team

### Point of contact.

**Main contact:** @

**Stakeholders:**