[actions/system_info] Print disk information for local filesystems only

[ababushk]

Details:

The -l flag shows info for local filesystem only, which leaves just the relevant data in our case, and avoids the error:

 MEMORY Info: 
df: /mount/build-artifacts: Resource temporarily unavailable
Filesystem      Size  Used Avail Use% Mounted on
overlay         124G   32G   93G  26% /
tmpfs            64M     0   64M   0% /dev
shm              64M     0   64M   0% /dev/shm
/dev/root       124G   32G   93G  26% /__w
overlay         124G   32G   93G  26% /mount
blobfuse2        80G  4.0K   80G   1% /mount/testdata0
blobfuse2        80G  4.0K   80G   1% /mount/testdata1
blobfuse2        80G  1.5M   80G   1% /mount/caches/pip
blobfuse2        80G  4.0K   80G   1% /mount/caches/ccache
blobfuse2        80G  4.0K   80G   1% /mount/caches/apt
blobfuse2        80G  4.0K   80G   1% /mount/caches/huggingface
tmpfs           980K   88K  892K   9% /run/docker.sock
tmpfs            16G     0   16G   0% /proc/acpi
tmpfs            16G     0   16G   0% /proc/scsi
tmpfs            16G     0   16G   0% /sys/firmware

As seen in this job https://github.com/openvinotoolkit/openvino/actions/runs/19969846773/job/57271685529

Also clarifying terminology a little bit.