[Request] Remove "Beta" label from Entity Risk Scoring

[jaredburgettelastic]

Description

We're marking Entity Risk scoring as Generally Available beginning in 8.18/9.0.

This will require removal of any "Beta" annotations throughout the docs regarding Entity Risk scoring

Background & resources

• PRs: TBD
• Issues/metas: https://github.com/elastic/security-team/issues/10958
• Point of contact: @jaredburgettelastic
• Test environments: TBD

Which documentation set does this change impact?

ESS and serverless

ESS release

8.18/9.0

Serverless release

The week of January 27th, 2025

Feature differences

No difference, but note that the Serverless docs don't actually mention that Risk scoring is in beta, so it's possible that no changes are required for Serverless.

API docs impact

N/A

Prerequisites, privileges, feature flags

No response