CI/CD: Ensure all Node.js versions are supported

[NickSeagull]

Bug Report

Current Behavior

There are times that unit tests fail on some Node.js versions. For example, CLI tests that check for environment variables complain on Node.js v18 and other multiple ones. I only managed to run the tests properly on v16.14.2

Expected behavior

We should support a specific number of Node.js versions, unit tests should pass on all of them equally. This behavior should be working on the latest minor version of the major versions we support.

E.g. if we support v18, v16 and v14, the CI/CD process should work on the latest versions of those.

Possible Solution

Modify the GitHub actions workflows so unit tests are run on the versions of Node.js we support