QA Failure for vmimage extractor (vmimage.py): libguestfs configuration on Ubuntu

CI job for any builds on Ubuntu 22 fails due to:
```
extractcode.ExtractErrorFailedToExtract: Unable to read kernel at: /boot/vmlinuz-6.5.0-1025-azure.
libguestfs requires the kernel executable to be readable.
This is the case by default on most Linux distributions except on Ubuntu.
```

This exception is raised at:
```
2025-01-25T13:22:44.5081493Z for kern in kernels:
2025-01-25T13:22:44.5081633Z if not os.access(kern, os.R_OK):
2025-01-25T13:22:44.5081786Z > raise ExtractErrorFailedToExtract(
2025-01-25T13:22:44.5081938Z f'Unable to read kernel at: {kern}.\n'
2025-01-25T13:22:44.5082088Z f'{GUESTFISH_KERNEL_NOT_READABLE}'
2025-01-25T13:22:44.5082214Z )
```

This could be handled using mocking for testing scenarios. However, more research is required on how such mocking can be implemented.