Disable generation of sourcemaps for @elastic/eui-theme-borealis and @elastic/eui-theme-common#8764

tkajtoch merged 3 commits intoelastic:mainelastic/eui:mainfrom

tkajtoch:fix/disable-sourcemaps-for-theme-packagestkajtoch/eui:fix/disable-sourcemaps-for-theme-packagesCopy head branch name to clipboard