libfabric: update code owner list (#2008)

## What?
update code owner list

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## Summary by CodeRabbit

* **Chores**
* Updated code ownership for Libfabric-related source, utility, and test
areas.

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Co-authored-by: Adit Ranadive <aranadive@nvidia.com>
Co-authored-by: ovidiusm <ovidium@nvidia.com>