Changes snowplow checkbox selector to label
requested to merge qa/358309-replace-generic-checkbox-with-gitlab-ui-styled-checkbox-in-app-views-admin into 358309-replace-generic-checkbox-with-gitlab-ui-styled-checkbox-in-app-views-admin
This MR is to support the QA changes needed for this MR
It changes the enable snowplow checkbox selector into a label selector.