test: add bytes method to mock Gaxios response in acl and headers tests

Author: thiyaguk09

handwritten/storage/test/acl.ts

@@ -392,6 +392,7 @@ describe('storage/acl', () => {
         arrayBuffer: async () => new ArrayBuffer(0),
         text: async () => '',
         json: async () => ({}),
+        bytes: async () => new Uint8Array(),
         clone: () => gaxiosResponse,
         blob: async () => new Blob([]),
         formData: async () => new FormData(),

handwritten/storage/test/headers.ts

@@ -53,6 +53,7 @@ describe('headers', () => {
       json: async () => ({}),
       clone: () => gaxiosResponse,
       blob: async () => new Blob([]),
+      bytes: async () => new Uint8Array(),
       formData: async () => new FormData(),
     };
     storageTransport = new StorageTransport({