Change Feed Iterator - The response does not contain all the service headers

[ealsur]

#1933 introduced an issue when the service response is converted to a Change Feed response, not all headers are copied:

azure-cosmos-dotnet-v3/Microsoft.Azure.Cosmos/src/ChangeFeed/ChangeFeedIteratorCore.cs

Lines 303 to 316 in a2e910a

	CrossFeedRangePage<Pagination.ChangeFeedPage, ChangeFeedState> crossFeedRangePage = enumerator.Current.Result;
	Pagination.ChangeFeedPage changeFeedPage = crossFeedRangePage.Page;
	ResponseMessage responseMessage;
	if (changeFeedPage is Pagination.ChangeFeedSuccessPage changeFeedSuccessPage)
	{
	responseMessage = new ResponseMessage(statusCode: System.Net.HttpStatusCode.OK)
	{
	Content = changeFeedSuccessPage.Content
	};
	}
	else
	{
	responseMessage = new ResponseMessage(statusCode: System.Net.HttpStatusCode.NotModified);
	}

azure-cosmos-dotnet-v3/Microsoft.Azure.Cosmos/src/ChangeFeed/ChangeFeedIteratorCore.cs

Lines 326 to 329 in a2e910a

	responseMessage.Headers.ContinuationToken = continuationToken;
	responseMessage.Headers.RequestCharge = changeFeedPage.RequestCharge;
	responseMessage.Headers.ActivityId = changeFeedPage.ActivityId;
	responseMessage.Trace = trace;

If there are any other extra backend headers that are being received, they are getting lost on the conversion step.