fix(GlToggle): set aria-disabled attribute

mentioned in commit c4ad5011

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!140 (merged)

mentioned in merge request status-page!776 (merged)

mentioned in merge request status-page!777 (merged)

mentioned in merge request gitlab!119269 (merged)

mentioned in merge request status-page!778 (merged)

mentioned in merge request gitlab!119347 (merged)

mentioned in merge request gitlab-docs!3815 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3385 (merged)