ExecuteFetchRequest is deprecated, change "Raw result" code

[rappen]

I guess the "Raw result" is no more possible, as they all response an EntityCollection now.

Either change Raw result if possible, or add a warning about deprecated, or simply remove this feature.

Comment below:

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Ah, that would explain. Another message, hence why the RetrieveMultiple was never triggered. Good to know :)

Maybe on a (small) sidenote: ExecuteFetchRequest is actually deprecated, but apparantly it still works :) But that also means the "Raw result" is not the preferred way to go.

https://docs.microsoft.com/en-us/dotnet/api/microsoft.crm.sdk.messages.executefetchrequest?view=dataverse-sdk-latest

Deprecated. Use the [RetrieveMultipleRequest](https://docs.microsoft.com/en-us/dotnet/api/microsoft.xrm.sdk.messages.retrievemultiplerequest?view=dataverse-sdk-latest) class.

Originally posted by @chironh in #725 (comment)