POST bulk execute evaluations

Use the /api/v1/evaluations/execute/bulk (POST) endpoint to trigger multiple evaluations in a single request.

The endpoint accepts a list of evaluation GUIDs and starts all specified evaluations at the same time. This approach avoids the need for parallel API calls and prevents refresh-token conflicts.

The response returns a consolidated status for each evaluation in the batch. Any invalid, non-existent, or currently running evaluation GUIDs are reported with error details.