Something is triggering presumably an infinite loop in the test runner after it's done npm ci?
Example:
https://integration.wikimedia.org/ci/job/quibble-vendor-mysql-php74-selenium-docker/2359/console
00:14:33.825 npm WARN deprecated core-js@2.6.12: core-js@<3.4 is no longer maintained and not recommended for usage due to the number of issues. Because of the V8 engine whims, feature detection in old core-js versions could cause a slowdown up to 100x even if nothing is polyfilled. Please, upgrade your dependencies to the actual version of core-js.
00:14:36.926 Build timed out (after 60 minutes). Marking the build as failed.
01:00:00.039 Build was aborted
Seen this on a few runs today. Maybe an issue in CI/infrastructure, maybe in the tests?