[REQUEST][8.19,9.1, and Serverless]: Gap remediation being GA'd

[yctercero]

Description

Gap remediation is no longer beta in 8.19 and 9.1. To reflect this change, we'll need to remove the beta tag from the following places:

• https://www.elastic.co/guide/en/security/8.18/alerts-ui-monitor.html#gaps-table

Resources

PR removing badge: TBD

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

N/A

What release is this request related to?

8.19.0, 9.1.0, Serverless

Collaboration model

The documentation team

Point of contact.

Main contact: @nkhristinin

Stakeholders: @approksiu @yctercero