[Security][9.4 & Serverless][RBAC] Ability to grant access to alerts

[nastasha-solomon]

Summary

Fixes https://github.com/elastic/docs-content-internal/issues/796.

Preview

• Detections privileges | Manage alerts: Doc's what's needed to manage alerts in Serverless/9.4, and previous releases.
• Entity risk scoring - Updated custom stack roles privs to show access needed to view alert risk contributions in entity details. Need to know which predefined roles provide this access.
• View the Privileged user monitoring dashboard - Updated privs for viewing the Privileged user monitoring dashboard.
• Attack discovery - Added a new tab for privs needed to access Attack discovery alerts.
• Cases - Updated privs for adding alerts to cases.

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

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[github-actions]

✅ Vale Linting Results

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[github-actions]

🔍 Preview links for changed docs

• explore-analyze/cases/control-case-access.md
• solutions/security/advanced-entity-analytics/entity-risk-scoring-requirements.md
• solutions/security/advanced-entity-analytics/privileged-user-monitoring-requirements.md
• solutions/security/ai/attack-discovery.md
• solutions/security/detect-and-alert/detections-privileges.md

[alaudazzi]

I left a few suggestions, otherwise LGTM.

[nastasha-solomon]

Validated that alerts rbac is available in this week's serverless release.