feat(css): add gl-focus-bg-t-gray-a-08 class
What does this MR do?
Add $focus: true to generate gl-focus-bg-t-gray-a-08 class.
Allows super sidebar nav item to have background on :focus as per design https://www.figma.com/file/kAAMkIqKPE4rRYo1JQIheI/Navigation-Redesign?node-id=7389-255528&t=tDVpWND9MEety55Z-4
Edited by Scott de Jonge