Fix autoscaling request to update dsChecksum

[Danielss89]

Fixes #1340

Updates the updateNodepool function in services/context-box/server/domain/usecases/update_nodepool.go to correctly update the dsChecksum alongside the desiredState during autoscaling requests.

• Adds logic to calculate and update dsChecksum after updating the nodepool, ensuring the autoscaler functions as expected by triggering builds when the desiredState changes.
• Utilizes the utils.CalculateChecksum function to generate the new dsChecksum and updates it in the pb.Config object before saving to the database.
• Maintains the existing functionality of updating the nodepool count & nodes in both desired and current state, and initiating a build by updating CsChecksum with a dummy value.

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