Add Illumina config to test profiles so that they match CI tests

[atrigila]

The CI tests are currently executed with the profile configuration -profile test,illumina,docker, which differs from the typical -profile test,docker that most nf-core pipelines use.

If the users run the pipeline with -profile test,docker it would lead to the protocol custom to be used, instead of illumina. This inconsistency could lead to confusion, as the standard user environment does not accurately reflect the same results as the CI test environment.

[atrigila]

Completed via #374