✨ [Integration.DataFactory] Add support for Dataflows which contain flowlets

[ClementVaillantCodit]

A dataflow can contain one or multiple flowlet.

A flowlet is acting like a piece of dataflow that can be reused.

More information here: https://learn.microsoft.com/en-us/rest/api/datafactory/data-flow-debug-session/add-data-flow?view=rest-datafactory-2018-06-01&tabs=HTTP#dataflowdebugresource

Here is a code sample on how to add a flowlet to the DataFactoryDataFlowDebugPackageContent:

if (flowletNames?.Count > 0)
{
    foreach (var flowletName in flowletNames)
    {
        // get the flowlet
        DataFactoryDataFlowResource flowlet = (await _datafactoryResource.GetDataFactoryDataFlowAsync(flowletName)).Value;

        var dataFactoryFlowletDebugInfo = new DataFactoryDataFlowDebugInfo(flowlet.Data.Properties)
        {
            Name = flowletName
        };
        dataFactoryDataFlowDebugPackageContent.DataFlows.Add(dataFactoryFlowletDebugInfo);
    }
}

This can be re-used and re-adjusted in Arcus.Testing.Integration.DataFactory