test: relax check in verify-graph

Relax the check regarding presence of async resources in graph to
allow extra events. Before this change events not mentioned in
reference graph were allowed but that one specified must match
exactly in count. Now it's allowed to have more events of this
type.

Refs: https://github.com/nodejs/node/pull/27477
Fixes: https://github.com/nodejs/node/issues/27617

PR-URL: https://github.com/nodejs/node/pull/27742


Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>