Security solution ticket with detailed feature description https://github.com/elastic/security-team/issues/2504

Description

We need to add documentation for the new alert assignments feature. It is planned to merge changes this or next week.

The key items of the Alert User Assignment feature:

• It is possible to assign a user/s to alert/s
• There is a new "Assignees" column in the alerts table which displays avatars of assigned users
• There is a bulk action to update assignees for multiple alerts
• It is possible to see and update assignees inside the alert details flyout component
• There is an "Assignees" filter button on the Alerts page which allows to filter alerts by assignees

This feature will be available in both ESS and Serverless