Fix TypeSpec Validation drift in Network 2025-09-01 virtualNetwork swagger

[Copilot]

ARM (Control Plane) API Specification Update Pull Request

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Purpose of this PR

The TypeSpec Validation job failed because committed swagger in stable/2025-09-01/virtualNetwork.json did not match current tsp compile output for the Network TypeSpec project.
This PR updates the generated swagger to remove compile-time drift so CI can validate cleanly.

What's the purpose of this PR? Check the specific option that applies. This is mandatory!

• New resource provider.
• New API version for an existing resource provider. (If API spec is not defined in TypeSpec, the PR should have been created in adherence to OpenAPI specs PR creation guidance).
• Update existing version for a new feature. (This is applicable only when you are revising a private preview API version.)
• Update existing version to fix OpenAPI spec quality issues in S360.
• Convert existing OpenAPI spec to TypeSpec spec (do not combine this with implementing changes for a new API version).
• Other, please clarify:
  • Sync generated swagger with current TypeSpec emitter output to fix failing TypeSpec Validation (Compile rule).

Due diligence checklist

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and followed the instructions by checking all the boxes:

• I confirm this PR is modifying Azure Resource Manager (ARM) related specifications, and not data plane related specifications.
• I have reviewed following Resource Provider guidelines, including
  ARM resource provider contract and
  REST guidelines (estimated time: 4 hours).
  I understand this is required before I can proceed to the diagram Step 2, "ARM API changes review", for this PR.
• A release plan has been created. If not, please create one as it will help guide you through the REST API and SDK creation process.

Additional information

• Change scope

  • Regenerated: specification/network/resource-manager/Microsoft.Network/Network/stable/2025-09-01/virtualNetwork.json
  • No TypeSpec source edits; this is generated-output alignment only.

• What changed in regenerated swagger

  • info.title / info.description updated to current emitter output.
  • AddressPrefixSets tag ordering aligned with generated output.
  • addressPrefixes.minItems ordering normalized in schema.
  • Removed stale upgradedToV2 properties no longer emitted in the affected definitions.

• Representative diff snippet

{
  "info": {
    "title": "WebApplicationFirewallManagement",
    "description": "APIs to manage web application firewall rules."
  }
}

Viewing API changes

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