chore: use native error messages from command output

[Integral-Tech]

Description

• When dmesg or modinfo returns error, we can just use their native error messages instead of custom ones. They are sometimes clearer, for example:

Native error message from dmesg

dmesg: read kernel buffer failed: Operation not permitted

Custom error message in kmon

failed to retrieve dmesg output

The first one indicates that the error is caused by "Operation not permitted", while the second one doesn't.

Motivation and Context

Make error messages clearer.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation and changelog accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• Rustfmt and Rust-clippy passed.

[Integral-Tech]

@orhun Suggestions applied :)

[orhun]

thanks!

[orhun]

ah, can you run cargo fmt and push the changes?

[Integral-Tech]

@orhun Done :)

[orhun]

Thanks!