Investigate ERR_NAME_NOT_RESOLVED Puppeteer failures in integration tests

Created by: felixfbecker

This has been happening occasionally both in CI and locally for me.

Example: https://buildkite.com/sourcegraph/sourcegraph/builds/75931#d812434d-34eb-482c-afa1-3a47d420c0df/111-2489

This could be a bug in our new adapter because I don't remember this happening in the past months.