Add error message to insights when query times out

What does this MR do and why?

This MR adds a more descriptive error message when the Insights page fails with statement timeout.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #374919 (closed)