Adds label description to issue board title

## What does this MR do?

Adds the label description as a tooltip the issue board title. Tooltip is not visible on the backlog or done list.

## Screenshots (if relevant)

![tooltip-title](/uploads/e807a7ff6c48ac2181c4d4e86adf0f77/tooltip-title.gif)

## What are the relevant issue numbers?

Closes #22710

See merge request !6743