Fix component option order in test_case_show

This fixes `vue/order-in-components` violations in the
`{,ee/}app/assets/javascripts/test_case_show` directories.

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/297216.

ee/app/assets/javascripts/test_case_show/components/test_case_show_root.vue

@@ -34,6 +34,7 @@ export default {
     IssuableShow,
     TestCaseSidebar,
   },
+  mixins: [TestCaseGraphQL],
   inject: [
     'projectFullPath',
     'testCaseNewPath',
@@ -42,7 +43,6 @@ export default {
     'descriptionPreviewPath',
     'descriptionHelpPath',
   ],
-  mixins: [TestCaseGraphQL],
   data() {
     return {
       testCase: {},

ee/app/assets/javascripts/test_case_show/components/test_case_sidebar.vue

@@ -19,6 +19,7 @@ export default {
   directives: {
     GlTooltip,
   },
+  mixins: [TestCaseGraphQL],
   inject: [
     'projectFullPath',
     'testCaseId',
@@ -28,7 +29,6 @@ export default {
     'labelsManagePath',
     'projectsFetchPath',
   ],
-  mixins: [TestCaseGraphQL],
   props: {
     sidebarExpanded: {
       type: Boolean,