Use SVG for closing icon of toasts
Follow-up from !235 (comment 159316006):
Currently we use x for the toast closing icon but we should use an SVG icon instead (https://gitlab-org.gitlab.io/gitlab-svgs/?q=~close).
Follow-up from !235 (comment 159316006):
Currently we use x for the toast closing icon but we should use an SVG icon instead (https://gitlab-org.gitlab.io/gitlab-svgs/?q=~close).