feat(ci): save nextflow pid and tag all slurm jobs

[pbelmann]

This PR saves the pid and a generic number of the nextflow run in file. All slurm jobs are tagged by the generic number.

Example:

[c2/2ca15f] Cached process > wPipeline:wQualityControlList:_wFastqSplit:pFastpSplit (JobID: 11424, Sample: test2)
[d1/85ef55] Cached process > wPipeline:wQualityControlList:_wFastqSplit:pFastpSplit (JobID: 11424, Sample: test1)
[a7/ed3ce6] Cached process > wPipeline:wQualityControlList:_wFastqSplit:pJellyFish (2)
[7c/b3f4ba] Cached process > wPipeline:wQualityControlList:_wFastqSplit:pJellyFish (1)
[4e/9faf88] Cached process > wPipeline:wQualityControlList:_wFastqSplit:pNonpareil (JobID: 11424, Sample: test2)
[0e/13e83f] Cached process > wPipeline:wQualityControlList:_wFastqSplit:pNonpareil (JobID: 11424, Sample: test1)
[85/947159] Cached process > wPipeline:wAssemblyList:_wAssembly:_wCalculateMegahitResources:pPredictFlavor (JobID: 11424, Sample: test2)
[f2/ad7bde] Cached process > wPipeline:wAssemblyList:_wAssembly:_wCalculateMegahitResources:pPredictFlavor (JobID: 11424, Sample: test1)
[31/cc4784] Cached process > wPipeline:wAssemblyList:_wAssembly:pMegahit (JobID: 11424, Sample: test2)
[fa/03c8e5] Cached process > wPipeline:wAssemblyList:_wAssembly:pMegahit (JobID: 11424, Sample: test1)

Once the PR is merged a cron job on the ci machine will periodically check for running processes and delete slurm jobs if no nextflow process exists.

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