Support compact equipment disk usage changeSet

[monrog2]

Summary

• parse both legacy and compact F1820/F1821/F1822 changeSet formats
• preserve fault-driven upgrade failures and report malformed values as NA
• add exact result assertions and issue-derived compact-format coverage
• document support for both APIC serializations

Validation

• pytest tests/checks/equipment_disk_limits_exceeded/test_equipment_disk_limits_exceeded.py (3 passed)
• pytest (917 passed)
• python -m py_compile aci-preupgrade-validation-script.py
• git diff --check

Closes #369

[monrog2]

Integration result for Equipment Disk Limits:

• The check completed on all 15 reachable runs represented by collected TGZ bundles.
• A live compact F1820 payload using avail:N, ..., used:N was parsed successfully and reported 82% utilization.
• Two live legacy payloads using avail (New: N), ..., used (New: N) were also parsed successfully and reported 81% and 100% utilization.
• All three active faults remained upgrade-blocking, preserving the existing fault-driven behavior.
• No parsing exceptions, NA values, or malformed Equipment Disk Limits results occurred.
• The remaining 12 collected runs had no matching F1820/F1821/F1822 faults and the check passed.

This provides positive live validation of the new compact parser and confirms that legacy parsing remains intact.