[OpenAPI][SOL013] Subscription-related test schemas across multiple APIs may need alignment

OpenAPI Background: Commit 40893444 (2024-07-19) proposed breaking change by fixing SubscriptionAuthentication data model. See definitions/SOL002_def.yaml for details.

API-Tests Impact: Subscription-related test schemas may need alignment (e.g. https://forge.etsi.org/rep/nfv/api-tests/-/blob/5.1.1/SOL002/VNFPerformanceManagement-API/schemas/PMJobModifications.json#L34)

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