feat(Button): Remove deprecated button variants

mentioned in commit 5268fc3c

mentioned in merge request status-page!903

mentioned in merge request gitlab!174288 (closed)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1333 (closed)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!357 (merged)

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!58 (merged)

mentioned in issue customers-gitlab-com#11467 (closed)

mentioned in issue customers-gitlab-com#11476 (closed)

mentioned in merge request gitlab!174696 (merged)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1361 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4209 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4210 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!4211 (closed)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1407 (closed)

mentioned in merge request gitlab-org/editor-extensions/gitlab-jetbrains-plugin!1446 (closed)