RTEMS | libcsupport: Fix heap state modification in malloc_info(). (!1551)

[Saahil Shaw (@Kernel)]

Saahil Shaw created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1551

Project:Branches: Kernel/rtems:fix-malloc-info-side-effect to rtems/rtos/rtems:main
Author: Saahil Shaw

## Summary

libcsupport: Fix heap state modification in malloc_info().

- Remove the delayed block freeing side effect from malloc_info().
- Drain delayed blocks in rtems_resource_snapshot_take() instead.
- Add necessary documentation for malloc_info().

Update [#41](https://gitlab.rtems.org/rtems/programs/gsoc/-/work_items/41)

## AI Details

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Gemini 4 (Argon)

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### Access

I have legitimate access to Google Gemini and I have not used a product that claims copyright on the generated output.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1551
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