Add Enum values for VPN migrationType

[Akshat Kale (akshatkale)]

ARM (Control Plane) API Specification Update Pull Request

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Purpose of this PR

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• 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:
  • Adding new enum values - UpgradeGatewayToDualStack and MigrateGatewayForPointToSiteProfile for VPN migration type VirtualNetworkGatewayMigrationType

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API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
TypeSpec	Microsoft.Network
Go	sdk/resourcemanager/network/armnetwork
JavaScript	@azure/arm-network
Java	com.azure.resourcemanager:azure-resourcemanager-network
Python	azure-mgmt-network

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Comment generated by After APIView workflow run.