Fix missing clear cache text inside the dependency proxy dropdown

Changelog: fixed

app/assets/javascripts/packages_and_registries/dependency_proxy/app.vue

@@ -55,6 +55,7 @@ export default {
     deleteCacheAlertMessageSuccess: s__(
       'DependencyProxy|All items in the cache are scheduled for removal.',
     ),
+    clearCache: s__('DependencyProxy|Clear cache'),
   },
   confirmClearCacheModal: 'confirm-clear-cache-modal',
   modalButtons: {

spec/frontend/packages_and_registries/dependency_proxy/app_spec.js

@@ -259,6 +259,12 @@ describe('DependencyProxyApp', () => {
 
             it('shows the clear cache dropdown list', () => {
               expect(findClearCacheDropdownList().exists()).toBe(true);
+
+              const clearCacheDropdownItem = findClearCacheDropdownList().findComponent(
+                GlDropdownItem,
+              );
+
+              expect(clearCacheDropdownItem.text()).toBe('Clear cache');
             });
 
             it('shows the clear cache confirmation modal', () => {