[6.x] EUI 5.8.1 comes with a brand color refresh. Also removes lots of KUI (#27009)#27429

snide merged 2 commits intoelastic:6.xelastic/kibana:6.xfrom

snide:backport/6.x/pr-27009snide/kibana:backport/6.x/pr-27009Copy head branch name to clipboard