linter: use simdutf8 for validating files

[Boshen]

See rolldown/rolldown#2040

Our code to change is:

oxc/crates/oxc_linter/src/service.rs

Lines 179 to 183 in 666282a

	let file_result = fs::read_to_string(path).map_err(|e| {
	Error::new(OxcDiagnostic::error(format!(
	"Failed to open file {path:?} with error \"{e}\""
	)))
	});

[shulaoda]

Is it just changing this one place? I see that many places have used read_to_string.

[Boshen]

Is it just changing this one place? I see that many places have used read_to_string.

Feel free to change it if it's in a hotspot for the linter.