fix(GlBarChart): Replace the getDom to getZr for supporting edge

mentioned in commit 9882c722

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!152 (merged)

mentioned in merge request status-page!801 (merged)

mentioned in merge request status-page!802 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3416 (merged)

mentioned in merge request gitlab-docs!3926 (merged)

mentioned in merge request gitlab!122801 (closed)