In order to promote the Puppeteer tests (remote(pup)) to Tier-2,
we need manifest support so that individual test files can be disabled.

This means we’d have to write a custom test runner for the Node.js tests
that would take into account information from the Mozilla-proprietary manifest format.
It would also be beneficial if this test runner emitted results in a format friendly to mozlog.

We already have Puppeteer tests running as Tier 1 for a while. To determine what's expected to fail we have necessary details in the following file:
https://searchfox.org/mozilla-central/source/remote/test/puppeteer-expected.json

That means it's actually our puppeteer specific implementation of such a requested manifest file. As such marking as dupe of bug 1607474.