feat(Banner): Remove redundant role

mentioned in commit 49dd29d2

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!133 (merged)

mentioned in merge request status-page!756 (merged)

mentioned in merge request gitlab!117311 (merged)

mentioned in merge request gitlab!117429 (merged)

mentioned in merge request gitlab-docs!3774 (merged)

mentioned in merge request gitlab-docs!3775 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3352 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3353 (merged)