SCHED-411: use native pyxis

[itechdima]

Problem

Old pyxis fork instead of upstream version due to unavailability to cache squashfs files.

Solution

Update pyxis to 0.23.0 and use its logic for enroot importer, so we change our own implementation to native.

Testing

Initial load

root@login-0:~# time srun -w worker-1 --container-image=nvidia/cuda:13.1.1-cudnn-devel-ubuntu22.04 hostname
cpu-bind=MASK - worker-1, task  0  0 [2154]: mask 0x3 set
pyxis: importing docker image: nvidia/cuda:13.1.1-cudnn-devel-ubuntu22.04
pyxis: imported docker image: nvidia/cuda:13.1.1-cudnn-devel-ubuntu22.04
worker-1

real	1m57.889s
user	0m0.000s
sys	0m0.018s

Different worker uses cache (with different user):

nebius@login-0:~$ time srun -w worker-0 --container-image=nvidia/cuda:13.1.1-cudnn-devel-ubuntu22.04 hostname
cpu-bind=MASK - worker-0, task  0  0 [2434]: mask 0x3 set
pyxis: importing docker image: nvidia/cuda:13.1.1-cudnn-devel-ubuntu22.04
pyxis: imported docker image: nvidia/cuda:13.1.1-cudnn-devel-ubuntu22.04
worker-0

real	0m15.814s
user	0m0.004s
sys	0m0.015s

Release Notes

Feature: udpate pyxis to 0.23.0, enroot to 4.1.1. Use enroot importer extension in pyxis to cache squashfs files.