The spilled bytes metric of CometSort is not a size metric

[Kontinuation]

Describe the bug

The metrics of CometSort nodes shown in the SQL tab of Spark UI have invalid spilled bytes metrics. It shows spilled bytes as time instead of size.

Steps to reproduce

Run any SQL queries involving native sort with comet enabled.

Expected behavior

Spill size shown as size instead of time.

Additional context

This problem is reproduced using the latest commit of the main branch: f64553b