Add retry button to analytics dashboard panel errors

Problem to solve

Following Add error state to panels (#391707 - closed) we want to provide users with the ability to retry failed queries without needing to refresh the entire page.

Design

Implementation plan

frontend 2️⃣

• Add a Retry button the panel error popover.
• On click, call the panel's data source fetch method.
  • For data sources that don't actually fetch data, trigger another render of the visualization. This can be done once we actually have visualizations that don't fetch data.
• Update specs.