Cmake configure task removes commented lines from tasks.json

### Brief Issue Summary

- Let tasks.json contain commented lines
- command palette > configure task
- select cmake build
- see commented lines disappear

### CMake Tools Diagnostics

_No response_

### Debug Log

_No response_

### Additional Information

_No response_

Reproduce the issue through the command palette’s Configure Task flow, selecting CMake build, with commented lines in tasks.json. Trace the task configuration handling used by that entry point and verify that the comments remain after configuration; the payload names no tests or implementation files.

Written by the indexing model from the issue text.