Change the default eigensolver for state parallelization to be Chebyshev filtering.
Description
As part of the changes suggested in #1100, this changes the default eigensolver for state parallelization to be Chebyshev filtering.
News snippet
Change the default eigensolver for state parallelization to be Chebyshev filtering.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.