Fix violated rule R4010: Add default error response for AgentPools_GetAvailableAgentPoolVersions in 2022-07-01#19901

dw511214992 merged 1 commit intoAzure:dev-containerservice-Microsoft.ContainerService-2022-07-01Azure/azure-rest-api-specs:dev-containerservice-Microsoft.ContainerService-2022-07-01from

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