Dataflow Gen2: Lakehouse destination - Service Principal (SPN) support

[frithjof_v]

Currently, the Lakehouse destination only supports Organizational account authentication.

This means the destination connection is depending on a specific user's account.

Please make it possible to use Service Principal authentication instead.

By going through the destination settings inside the Dataflow Gen2, I can see that the options for connecting to the various destinations are:

* **Lakehouse**

   * Organizational account

* **Warehouse**

   * Organizational account

   * Service Principal

* **Fabric SQL Database**

   * Organizational account

   * Service Principal

* **Azure SQL Database**

   * Basic (username/password)

   * Organizational account

   * Service Principal

   * Workspace identity

   * Note: Basic and Service Principal options can use Azure Key Vault references in this connector.

* **Azure Data Explorer**

   * Organizational account

   * Service Principal

* **SharePoint**

   * Anonymous

   * Organizational account

   * Service Principal

   * Workspace identity

* **Azure Data Lake Storage Gen2**

   * Account key

   * Organizational account

   * Shared Access Signature (SAS)

   * Service Principal

   * Workspace identity

(Sorry about the bad formatting).

The Lakehouse destination only supports Organizational account - why?