Show linked incidents in Alert groups table and AG detail page

[raphael-batte]

What would you like to see!

Problem statement
As an IRM user, I need a visible connection between OnCall alert groups and Incidents because the current UI can’t cover my use cases.

Expected result
Adding information about the linked incident to alert groups:

• to the alert groups table as a new column
• to the alert group page in the form of a badge with a link
• in the alert group timeline as an events about the declaration of an incident, as an incident resolution
• add ability to filter alert groups by linked Incident criteria

Product Area

Alert Flow & Configuration

Anything else to add?

No response

[github-actions]

The current version of Grafana OnCall, at the time this issue was opened, is v1.8.8. If your issue pertains to an older version of Grafana OnCall, please be sure to list it in the PR description. Thank you 😄!