linting modules/subworkflows - add failure when no snapshots for versions

[maxulysse]

Description of the bug

the versions of tools is highly reproducible on docker/singularity, but it's often a lottery in conda.
I'd like a linting test that ensure we snapshot for modules, either:

• process.out.versions
• process.out (only since it contains versions)

we snapshot for subworkflows either:

• workflow.out.versions
• workflow.out (only since it contains versions)

Command used and terminal output

No response

System information

No response

[maxulysse]

Note:
For subworkflows, we don't always use modules, so only a warning.
For subworkflows, snapshotting versions could be empty in some tests if we skip all the tools from said subworkflow.

[maxulysse]

Related PRs:

• fastq_fastqc_umitools_trimgalore nf-test snapshot modules#4418
• pin htslib in all samtools/modules modules#4828
• pin htslib in all samtools dependant modules modules#4831
• nf-test to FASTQ_FASTQC_UMITOOLS_TRIMGALORE and pin cutadapt in trimgalore modules#4925

[mahesh-panchal]

Wasn't it an issue for bumping modules since then the snapshot wouldn't match ? If you checked if the output matched a regex, then that should be fine too for autobumping modules?