Fix resource detection for unset CPU and memory limits in cgroup v2

[mobratil]

Address the issue where /sys/fs/cgroup/cpu.max and /sys/fs/cgroup/memory.max report "max", indicating unset limits in cgroup v2.

Changes Made:

• When /sys/fs/cgroup/cpu.max reads "max", the number of CPU cores is now derived from the host's /proc/stat file.
• Similarly, available memory is determined from the host's /proc/meminfo file if /sys/fs/cgroup/memory.max contains "max".

Microsoft Reviewers: Open in CodeFlow