fix(csharp/src/Drivers/Databricks): update error type for connection errors when possible #3581
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The driver currently throws an AggregateException when an error occurs during the
connection.OpenAsync().Wait();call. This PR attempts to unwind the AggregateException and throw an AdbcException to conform to the ADBC spec. It keeps the AggregateException as the InnerException of the throw AdbcException to maintain the integrity of the stack.