Defuse timebomb test (it's not very nice)

I probably won't get to resolving the reason for this timebomb test so this PR defuses it.

In the future we should go for linter rules instead if possible / tests that track known bad practices to avoid breaking tests for unrelated changes. See https://github.blog/2021-05-04-how-we-use-web-components-at-github/#tooling for inspiration for a test like this.