test: exclude additional test for coverage

Exclude async-hooks/test-callback-error as it seems
to fail consistently when run with coverage on
the docker ubuntu16 machines we plan to run the
coverage sanity test on.

PR-URL: https://github.com/nodejs/node/pull/25833


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ben Coe <bencoe@gmail.com>