[Visual Refresh] Make Borealis default theme in EUI#8288

mgadewoll merged 4 commits intoelastic:eui-theme/borealiselastic/eui:eui-theme/borealisfrom

mgadewoll:eui-theme/175-make-borealis-default-in-euimgadewoll/eui:eui-theme/175-make-borealis-default-in-euiCopy head branch name to clipboard