fix(winpe): reuse Intel catalog on refresh failure

[mchave3]

Summary

Keep the Intel WinPE catalog update job successful when Microsoft Update Catalog is temporarily unavailable or returns an empty result page.

Reason

GitHub Actions job 97018046956 failed because Microsoft Update Catalog returned HTTP 200 pages with an empty results container. The unchanged script then threw when no Windows 11 Intel networking candidates were found.

Main changes

• Reuse the existing known-good Intel catalog entry when refresh fails.
• Leave the generated XML unchanged during fallback.
• Preserve the original failure when no valid cached catalog is available.
• Ensure a malformed cache does not block a healthy refresh.
• Add regression coverage and run it in the PowerShell analysis workflow.

Testing

• PowerShell parser checks for the changed script and test.
• PSScriptAnalyzer: 0 errors (existing warnings remain).
• Tests/Test-OSCatalogHistory.ps1.
• Tests/Test-IntelWirelessCatalogFallback.ps1.
• Live Intel generator run against the current empty Microsoft response; it reused the cache without changing its hash or timestamp.

Related job: https://github.com/foundry-osd/catalog/actions/runs/32567442973/job/97018046956

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