Group the workflow board by status category

Our development workflow has many granular states, like "Ready for testing", "Testing in progress", and "Testing failed." With this granularity, we don't have to ask developers about where the feature is – the status gives us enough information.

However, we don't want to see all of these statuses on the board. When viewing the board, the status category is enough detail. We'd like to be able to view the workflow board by status category as well.