quickstart sample tests: should export assets to specified path failed

[flaky-bot]

Note: #533 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: 09dcc71
buildURL: Build Status, Sponge
status: failed

Test output

Timeout of 360000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/workspace/samples/test/sample.test.js)
Error: Timeout of 360000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/workspace/samples/test/sample.test.js)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (09dcc71), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).