Handle VNet JSON case-collision failures with Resource Graph fallback

[mq-ssmith]

Summary\n- make dataCollectionVNets resilient when AzAPICall fails to parse mixed-case JSON keys\n- keep existing ARM call path first\n- add Resource Graph fallback (id,

ame, location, properties) when ARM parsing fails\n- continue collection for affected subscriptions instead of hard-skipping\n\n## Details\nThis addresses the real-world payload case where key casing collisions (for example Environment vs �nvironment) can break JSON conversion in the VNet ARM response.\n\n## Files changed\n- pwsh/AzGovVizParallel.ps1\n- pwsh/dev/functions/dataCollection/dataCollectionFunctions.ps1\n\n## Validation\n- PowerShell parser diagnostics report no errors in changed files\n- change is scoped to VNet collection only

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[mq-ssmith]

Additional context for reviewers:

This change addresses a real-world failure mode where VNet ARM payload parsing can fail due to case-colliding keys (example seen: Environment and environment), causing ConvertFrom-Json fallback paths to still fail for a subscription.

This PR keeps the existing ARM path first, then uses a Resource Graph fallback for VNet inventory so collection can continue instead of failing hard.