Fixed missing export

Squash commits of branch feature/popover:

- -added: popover and ci status story

- -fixed: license formats

- work in progress

- -added: popover stories

- work in progress

- work in progress

- work in progressclear

- work in progress

- -changed: realigned close button
added aria label to close button

- -added: comments

- -added: changelog file

- -fixed: findings

- -fixed: background

- -fixed: close button

- -fixed: arrow fill color

- -removed: has box shadow class, because popover already box-shadow

- -added: popover export



Co-authored-by: tzerr <thomas.zerr@cloudogu.com>

scm-ui/ui-styles/src/light.scss

@@ -109,3 +109,7 @@ footer.footer {
 .has-hover-visible:hover {
   color: $grey-darker !important;
 }
+
+.popover-arrow {
+  fill: $grey-light !important;
+}