feat(server): Add publicUsers toggle for user search (#14330)

* feat(server): Add publicUsers toggle for user search

* tests

* docs: add check:typescript for web PR checklist

* return auth.user when publicUsers is false - app testing

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

server/test/fixtures/system-config.stub.ts

@@ -117,4 +117,9 @@ export const systemConfigStub = {
       },
     },
   },
+  publicUsersDisabled: {
+    server: {
+      publicUsers: false,
+    },
+  },
 } satisfies Record<string, DeepPartial<SystemConfig>>;