WIP: [Storage] STD: concurrent 20 VM boot with five disks per VM

[Ahmad-Hafe]

What this PR does / why we need it:

Introduces the Software Test Description (STD) for the concurrent VM boot scenario.

Covers booting 20 VMs simultaneously, each with five VMI disk devices: one golden image boot volume (PVC clone via DataSource), one cloud-init disk, and three blank DataVolumes. Validates that storage provisioning handles parallel workload correctly.

__test__ = False prevents collection — this is a design-review artifact only. Implementation follows in a separate PR.

Which issue(s) this PR fixes:

Special notes for reviewer:

• special_infra + high_resource_vm markers included — scheduling 20 concurrent VMs requires sufficient cluster memory and storage provisioning capacity
• Architecture precondition added — Fedora golden image is architecture-specific; all schedulable worker nodes must match

jira-ticket:

https://redhat.atlassian.net/browse/CNV-88906

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• tests/storage/concurrent_vm_boot/__init__.py
• tests/storage/concurrent_vm_boot/test_concurrent_vm_boot.py

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[OhadRevah]

/lgtm

[Ahmad-Hafe]

/wip