test: correct assertion argument order

This conforms assertions to follow the argument order of
asserted then actual, and adds more explicit messages
to describe assertion failures.

PR-URL: https://github.com/nodejs/node/pull/23618


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>