instances: "after all" hook for "should list zones" failed

[flaky-bot]

Note: #975 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

---

commit: f5991bb
buildURL: Build Status, Sponge
status: failed

Test output

16 UNAUTHENTICATED: Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.
Error: 16 UNAUTHENTICATED: Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.
    at Object.callErrorFromStatus (/workspace/node_modules/@grpc/grpc-js/build/src/call.js:31:19)
        -> /workspace/node_modules/@grpc/grpc-js/src/call.ts:81:17
    at Object.onReceiveStatus (/workspace/node_modules/@grpc/grpc-js/build/src/client.js:190:52)
        -> /workspace/node_modules/@grpc/grpc-js/src/client.ts:352:36
    at Object.onReceiveStatus (/workspace/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:365:141)
        -> /workspace/node_modules/@grpc/grpc-js/src/client-interceptors.ts:462:34
    at Object.onReceiveStatus (/workspace/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:328:181)
        -> /workspace/node_modules/@grpc/grpc-js/src/client-interceptors.ts:424:48
    at /workspace/node_modules/@grpc/grpc-js/build/src/call-stream.js:188:78
        -> /workspace/node_modules/@grpc/grpc-js/src/call-stream.ts:330:24
    at processTicksAndRejections (internal/process/task_queues.js:79:11)
for call at
    at ServiceClientImpl.makeUnaryRequest (/workspace/node_modules/@grpc/grpc-js/build/src/client.js:160:30)
        -> /workspace/node_modules/@grpc/grpc-js/src/client.ts:324:26
    at ServiceClientImpl. (/workspace/node_modules/@grpc/grpc-js/build/src/make-client.js:105:19)
        -> /workspace/node_modules/@grpc/grpc-js/src/make-client.ts:189:15
    at /workspace/build/src/v2/bigtable_instance_admin_client.js:243:29
        -> /workspace/src/v2/bigtable_instance_admin_client.ts:378:25
    at /workspace/node_modules/google-gax/build/src/normalCalls/timeout.js:44:16
        -> /workspace/node_modules/google-gax/src/normalCalls/timeout.ts:54:13
    at OngoingCall.call (/workspace/node_modules/google-gax/build/src/call.js:67:27)
        -> /workspace/node_modules/google-gax/src/call.ts:81:23
    at NormalApiCaller.call (/workspace/node_modules/google-gax/build/src/normalCalls/normalApiCaller.js:34:19)
        -> /workspace/node_modules/google-gax/src/normalCalls/normalApiCaller.ts:43:15
    at /workspace/node_modules/google-gax/build/src/createApiCall.js:84:30
        -> /workspace/node_modules/google-gax/src/createApiCall.ts:118:26