test: improve assertion message in test-dns-any

Improve error message from "The expression evaluated to a falsy value"
to a message formatted dynamically that lists the record types found so
that someone investigating can look at the code and determine which
values are missing.

This came up because the test failed in nightly master branch CI but
generally passes. It may prove helpful to know what record types were
missing. (All of them? Just one? Something else?)

PR-URL: https://github.com/nodejs/node/pull/31697


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>