test: remove string literals for strictEquals/notStrictEquals

In short: Some unit tests are using string literals to simply tell you a
conclusion what's right/wrong BUT not tell you what actually values are.
So it's necessary to print them out in the console.

Refs: https://github.com/nodejs/node/pull/22849
PR-URL: https://github.com/nodejs/node/pull/22891


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>