feat(GlFormField): Allow form field groups to receive attributes

mentioned in commit 3e8dbf61

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!174 (merged)

mentioned in merge request status-page!839 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3432 (merged)

mentioned in merge request gitlab-docs!4123 (merged)

mentioned in merge request gitlab-docs!4124 (closed)

mentioned in merge request gitlab!128113 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3479 (merged)

mentioned in merge request gitlab!126562 (merged)