Use IOfferingsOperations to Determine if Target is Quantum-Executable

[ScottCarda-MS]

In AzureClient.cs, we define and use function IsQuantumExecutionTarget to determine if a target is quantum-executable. Instead we should use the API provided by the Service defined here: https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/quantum/Microsoft.Azure.Management.Quantum/src/Generated/QuantumManagementClient.cs#L82