As a PMM admin user, I want to be able click on a icon in the alert rule summary to have more details about the alert rule. The table row would expand to showing more details.
- There is a ↓ icon in the Name column;
- clicking on the icon, a new row appears under the one on which the icon was clicked;
- the newly opened row spans for the whole width of the table and contains the details to be shown (TBD);
- code and PRs get pushed to percona-platform/grafana repository
- test coverage
- honor light/dark mode