Lanzcos batch gpu test

Description

Add here a short description of what this merge request is about. Please mention if you changed any input option or the defaults in any way. Also say here if this merge request fixes any issue (see the gitlab documentation on how to do this).

News snippet

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Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.