[refurb] Add fix safety section (FURB105) (#17499)

## Summary

This PR add the `fix safety` section for rule `FURB105` in
`print_empty_string.rs` for #15584

Before:
```
def get_sep():
    print("side effect")
    return ""
    
print("", sep=get_sep())
```

After:
```
def get_sep():
    print("side effect")
    return ""
    
print()
```

---------

Co-authored-by: Brent Westbrook <36778786+ntBre@users.noreply.github.com>

crates/ruff_linter/src/rules/refurb/rules/print_empty_string.rs

@@ -30,6 +30,11 @@ use crate::{Applicability, Edit, Fix, FixAvailability, Violation};
 /// print()
 /// ```
 ///
+/// ## Fix safety
+/// This fix is marked as unsafe if it removes an unused `sep` keyword argument
+/// that may have side effects. Removing such arguments may change the program's
+/// behavior by skipping the execution of those side effects.
+///
 /// ## References
 /// - [Python documentation: `print`](https://docs.python.org/3/library/functions.html#print)
 #[derive(ViolationMetadata)]