[REQUEST][ResponseOps] Add Alert panel inDashboard external docs

[tiamliu]

User flows

• Adding a new Alerting panel to a dashboard
• Edit the Alerting panel in a dashboard
• View alerts details from the alerting table
• View Rules details from the alerting table

References
GH issue: elastic/kibana#197483
Wireframe : https://www.figma.com/design/c5FlBijdqWhJce2G9egO6j/New-Alert-panel-in-Dashboard--%3E--313?node-id=243-27879&p=f&t=K0ymd3OLpxxP4MWJ-0

Doc impact

• Need to add the Alerts panel type to the Visualizations category - https://www.elastic.co/docs/explore-analyze/visualize and
• Need to create a new page for the Alerts panel. The page should explain how the user flows listed above.

[nastasha-solomon]

@benironside I requested a demo of this feature next week. As I was exploring the feature in Serverless, I noticed a slight difference in the add alerts panel flow for Observability and Security projects (the following screenshot shows how the first step differs).

[nastasha-solomon]

Related issue: #1949
cc: @florent-leborgne