Migrate `gl-row-gap-*` to Tailwind equivalent

...ascripts/content_editor/components/formatting_toolbar.vue

...ascripts/error_tracking/components/error_details_info.vue

...ets/javascripts/vue_shared/components/markdown/header.vue

app/views/layouts/devise.html.haml

app/views/projects/_stat_anchor_list.html.haml

app/views/shared/_md_preview.html.haml

...ashboard/components/pipeline/security_reports_summary.vue

ee/app/assets/javascripts/tracing/details/tracing_header.vue

...ge_request_widget/components/approvals/approvals_list.vue

...jects/merge_requests/_code_owner_approval_rules.html.haml