Gate sync overview route for users without access (#27320)

* routes: add redirect if user does not have access to sync

* tests: verify redirect on sync overview page happens

* tests: organize tests modules to ensure enterprise is explicitly set up

ui/lib/sync/addon/routes/secrets/overview.ts

@@ -8,10 +8,12 @@ import { service } from '@ember/service';
 import { hash } from 'rsvp';
 
 import type FlagsService from 'vault/services/flags';
+import type RouterService from '@ember/routing/router-service';
 import type StoreService from 'vault/services/store';
 import type VersionService from 'vault/services/version';
 
 export default class SyncSecretsOverviewRoute extends Route {
+  @service declare readonly router: RouterService;
   @service declare readonly store: StoreService;
   @service declare readonly flags: FlagsService;
   @service declare readonly version: VersionService;
@@ -34,4 +36,10 @@ export default class SyncSecretsOverviewRoute extends Route {
         : [],
     });
   }
+
+  redirect() {
+    if (!this.flags.showSecretsSync) {
+      this.router.replaceWith('vault.cluster.dashboard');
+    }
+  }
 }