Test should test all methods

[Zethson]

      - name: Run pipeline with test data
        run: |
          nextflow run ${GITHUB_WORKSPACE} -profile test,conda --souporcell False --generate_anndata False

Currently we're only testing souporcell. Ideally, we should test all methods in a matrix.

ChatGPT will tell you how to write such a matrix @mari-ga . I'd then start including methods one by one to ensure that all of them work with the test profile. You might need to adapt the test profile or write new ones. Consult @wxicu here if necessary.