Enhance testing

[paescuj]

• Upgrade Jest to v28
• Lint tests with the help of eslint-plugin-jest
• Solve all lint problems
  • Refactor tests using a promise based approach instead of the "done" callback
  • Run "alias" tests with it.each instead of defining them twice
  • Move expectLinesForProcessStartAndStop & expectLinesForTimingsTable methods to expect.extend
  • Fix & re-enable 'is of success when a SIGINT is sent' test
• Update all lint / test related dependencies
  • Downgrade @types/node to current active LTS version (v16)
    Generally, it's advised to align types with the Node.js version - since we're targeting multiple Node.js version we pin the types to the current active LTS version
• Bundle 'concurrently' only once for all tests in bin/concurrently.spec.ts with the help of esbuild
  • Results in faster execution of the tests 🚀
  • Makes it (easier) possible to run the commands without a shell and thus get a correct behavior for the 'SIGINT' test

[coveralls]

Coverage remained the same at 100.0% when pulling 1d73678 on paescuj:test-enhancements into 93e0891 on open-cli-tools:main.

[gustavohenke]

This is nice! But it seems it assumes that the observers will emit synchronously... or did I miss anything?

[paescuj]

Oh, you're right! Good catch, thanks! I'm going to address this in the next days...

[paescuj]

So what do you think about this? => #369 😃