SSBC: Show status pill on "Executions" tab with active executions

Created by: courier-new

If any executions are actively happening on a batch change, show pill with count from BC page "Executions" tab. Figma: https://www.figma.com/file/cTKjwbvWqU6xAykZmCTTqy/SSBC?node-id=1485%3A53103