Allow Rome to exit with an error code on warnings

[nstepien]

For Rome, all the lint rules we've enabled are set to "warn" instead of "error",
the idea is to help devs differentiate between TS type errors (red) and Rome/ESLint lints (yellow) in their code editor.
I've seen junior devs confuse type and lint issues, so I think it's helpful.

Now the issue is that Rome does not exit with an error code, so CI always passes when warnings are found.
We don't want CI to pass on any warnings.

With ESLint we use the --max-warnings 0 flag, but there is no equivalent feature in Rome.
https://eslint.org/docs/latest/use/command-line-interface#--max-warnings

^{Bonus point: Rome's logo is yellow🟨 , maybe TS's squiggles should be blue!🟦}