fix(banner): Remove deprecated info button variant in favor of confirm

mentioned in commit 80ea665d

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!2272 (merged)

mentioned in merge request status-page!241 (merged)

mentioned in merge request status-page!242 (merged)

mentioned in merge request gitlab!55107 (merged)

mentioned in merge request gitlab-docs!1564 (merged)

mentioned in commit b59c0b54