build: remove duplicate async-hooks and known_issues test runs

The `default` test suite in `test.py` includes `async-hooks` and
`known_issues`. Our current setup results in those test suites being run
twice during each CI run. Remove the duplication.

PR-URL: https://github.com/nodejs/node/pull/17912


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>