feat(forge-lint): return non-zero exit code when lint fails

[cruzdanilo]

Component

Forge

Describe the feature you would like

forge lint is always returning a success exit code (0), even when there are issues. this makes it harder to use it on ci.

Additional context

No response

[0xClandestine]

noticed this as well

[srdtrk]

It would be good to be able to adjust what severity of lint leads to non-zero exit code. Some may want to return a zero exit code if the lint only finds info and low severity.