Update h1 to use .gl-font-size-h-display class

...hentication/two_factor_auth/components/recovery_codes.vue

.../javascripts/environments/components/environment_form.vue

...ts/environments/components/environments_detail_header.vue

...ts/javascripts/feature_flags/components/feature_flags.vue

...javascripts/feature_flags/components/new_feature_flag.vue

app/assets/javascripts/issues/show/components/title.vue

app/assets/javascripts/jira_connect/branches/pages/index.vue

...s/javascripts/jira_import/components/jira_import_form.vue

...ts/vue_shared/issuable/show/components/issuable_title.vue

app/assets/stylesheets/framework/page_title.scss

app/assets/stylesheets/framework/typography.scss

app/assets/stylesheets/pages/detail_page.scss

app/views/abuse_reports/new.html.haml

app/views/admin/abuse_reports/index.html.haml

app/views/admin/applications/edit.html.haml

app/views/admin/applications/index.html.haml

app/views/admin/applications/new.html.haml

app/views/admin/applications/show.html.haml

app/views/admin/background_jobs/show.html.haml

app/views/admin/broadcast_messages/index.html.haml