fix(ext/node): read correct CPU usage stats on Linux (#24732)

Fixes #24731

<img width="554" alt="deno_fixed"
src="https://github.com/user-attachments/assets/691f2f89-d979-4ca5-be9a-cf51446cd9b2">

The total CPU usage row is ignored and info from `cpu0` and `cpu1` is
correctly read.

---------

Signed-off-by: MrEconomical <47700125+MrEconomical@users.noreply.github.com>

ext/node/ops/os/cpus.rs

@@ -246,12 +246,13 @@ pub fn cpu_info() -> Option<Vec<CpuInfo>> {
   let reader = std::io::BufReader::new(fp);
 
   let mut count = 0;
-  for (i, line) in reader.lines().enumerate() {
+  // Skip the first line which tracks total CPU time across all cores
+  for (i, line) in reader.lines().skip(1).enumerate() {
     let line = line.ok()?;
     if !line.starts_with("cpu") {
       break;
     }
-    count = i;
+    count = i + 1;
     let mut fields = line.split_whitespace();
     fields.next()?;
     let user = fields.next()?.parse::<u64>().ok()?;