Fix gpu and default eth detection in job exporter

[abuccts]

Fix GPU and default Ethernet interface detection in job exporter.

[Copilot]

Pull Request Overview

This PR fixes GPU and default Ethernet interface detection in the job exporter by improving hardware detection methods and making Ethernet device configuration more robust.

• Replaced PCI-based GPU detection with kernel module detection for more accurate GPU identification
• Added automatic detection of default network interface instead of hardcoding 'eth0'
• Added safety checks to prevent network monitoring when no Ethernet device is configured

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/job-exporter/src/Moneo/src/worker/exporters/node_exporter.py	Added netifaces import, implemented get_default_iface() function, and added ethernet_device validation checks
src/job-exporter/build/moneo-gpu-exporter_entrypoint.sh	Changed GPU detection from lspci to lsmod for AMD and NVIDIA graphics cards

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