Bot job manager crashes

[TopRichard]

Checking out the PR in : NorESSI/software-layer#132, we can see that job ids 5477 and 5478 have been submitted, yet the URLs for those jobs are not accessible, this causes an issue for the bot as it is unable to update the job status, and thus the job manager crashes.

Note: The jobs were manually cancelled, but it seems unlikely that this deleted the corresponding comments on GitHub.

[trz42]

Additional information:

• for some reason the event handler received the ids of the PR comments created and also the URL to the created PR comments
• the URLs were used to create the comment Adding GROMACS/2021.3 with foss/2021a to NESSI/2023.06 NorESSI/software-layer#132 (comment)
• later when those comments each representing a job shall be updated using the comment id, the crash happened ... because these comments don't exist

[laraPPr]

Opened a pr so that the job manager does not crash if slurm is temporarily not available.
Only tested that it logged correctly in the PyGhee log when the squeue command fails.
This can make the running of the bot look a little weird because I have seen what the bot does when jobs suddenly disappear and reappear as current_jobs

• fix for job manager crash: Unable to contact slurm controller #255