[Search] Background session management UI

[lizozom]

Part of #61738

The Background Session feature requires a new management section under Stack Management, to manage background sessions.

The list should show a table of the current user's sessions:

• Name
• Icon indicating the app that created the session
• Creation time
• Status (Running, finished, expired, etc.)
• Actions

It should be sorted by creation time descending by default.
The list should support searching, filtering and sorting as other management views do.

If there are running sessions, the list should re-fetch data periodically. I would use the snapshot restore view as reference for this behavior.

Each row should support the following actions:

• Navigate back to app
• Cancel (expire) a running background session
• Extend the expiration of a background session

Note: The Session objects will be hidden, requiring some special handling.

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[tsullivan]

Hi, I'd like to get started on this task. I am going to assign it to myself and begin to work on making the POC for this UI.

As I understand, completion of this task is dependent on new server-side API(s) in Kibana for Background session. I'll have to keep track of that progress so that when the time is right, the POC for the UI can switch over to using real APIs.