[App Insights/Operational Insights] Fix C# directive for result type.

[alexeldeib]

This field in the response is array of array of string in the swagger, but is array of array of "any" value type in reality. Semantically, it's the individual cell content returned from database queries. I've addressed this on a language by language basis since the wildcard type support is somewhat inconsistent. I've been testing modeling in C# as "object" and it produces the desired behavior.

Related: Azure/azure-powershell#6032

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