Test case layout update

...pts/vue_shared/issuable/show/components/issuable_body.vue

...ue_shared/issuable/show/components/issuable_edit_form.vue

...s/vue_shared/issuable/show/components/issuable_header.vue

...ue_shared/issuable/show/components/issuable_show_root.vue

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

...red/issuable/sidebar/components/issuable_sidebar_root.vue

app/assets/stylesheets/components/detail_page.scss

app/assets/stylesheets/framework/sidebar.scss

...scripts/test_case_show/components/test_case_show_root.vue

...vascripts/test_case_show/components/test_case_sidebar.vue

...ipts/test_case_show/components/test_case_sidebar_todo.vue

ee/spec/features/projects/quality/test_case_show_spec.rb

...end/test_case_show/components/test_case_show_root_spec.js

...ntend/test_case_show/components/test_case_sidebar_spec.js

.../test_case_show/components/test_case_sidebar_todo_spec.js

locale/gitlab.pot

...issuable/sidebar/components/issuable_sidebar_root_spec.js