test: fix flaky test-domain-abort-on-uncaught

test-domain-abort-on-uncaught is flaky under load. Move it to sequential
so it is not competing with other tests for resources.

PR-URL: #11817
Fixes: #11814
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Gibson Fahnestock <[email protected]>
Reviewed-By: Daijiro Wachi <[email protected]>
Reviewed-By: Santiago Gimeno <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: Trott