feat: Consider disabling `unreachable_from_main` by default

[lamnhan066]

Description

There are still many unresolved issues related to this lint, as we can see here, especially this false positive issue.

I noticed that this lint is disabled by default, as described in #99, but it was added in v10.0.0 without any specific reason or related issues mentioned.

Requirements

• All CI/CD checks are passing.
• There is no drop in the test coverage percentage.

Additional Context

No response