fix(GlButton): Fix non-hidden caret with no-caret dropdown button

mentioned in commit d030f156

mentioned in merge request gitlab!55885 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!2292 (merged)

mentioned in merge request status-page!254 (merged)

mentioned in merge request status-page!262 (merged)

mentioned in merge request status-page!263 (merged)