linting for nf-test snapshot

[maxulysse]

Description of feature

Make sure that no input are snapshot by nf-test:
As it will err if we change the path to the files:

• github: /nf-core/test-datasets/modules/data/genomics/sarscov2/illumina/fastq/test_1.fastq.gz
• s3: /ngi-igenomes/testdata/nf-core/modules/genomics/sarscov2/illumina/fastq/test_1.fastq.gz

[mashehu]

can you link to an example where this was done? or is this hypothetical?