Generation of sample sheets hindering cleaning of Illumina runs

[diitaz93]

Description

• Illumina sequencing runs are not getting cleaned
• The cleaning relies on the timestamp of the sequencing folder (cleaning runs older than certain time)
• The timestamps of the folders seems to be always no more than 10 minutes old
• @Vince-janv did some experiments (see https://github.com/Clinical-Genomics/bug-reports/issues/16) and concluded that the system in charge of the generation of the sample sheets is the one updating the timestamp of the sequencing run folders (cg demultiplex sample-sheet create-all)
• The generation of the sample sheets is designed to overwrite the sample sheet in the directory (using os.link()) with the sample sheet in housekeeper if the later passes validation. This was designed to overwrite any sample sheet in an old format fetched from pdc.

To Reproduce
Turn off the sample sheet generator timer and the directories don't get their timestamps updated
See https://github.com/Clinical-Genomics/bug-reports/issues/16

Expected behavior
An Illumina sequencing run directory which has a valid sample sheet will not have its time stamp updated.

[Vince-janv]

Technical refinement

In cg.apps.demultiplex.sample_sheet.api.IlluminaSampleSheetService._use_sample_sheet_from_housekeeper add the line if sample_sheet_path.samefile(run_directory_data.sample_sheet_path): before the overwriting of samplesheet

Make sure to except FileNotFountError