Kill all grid engine jobs on shutdown

[adamnovak]

I think all batch systems are meant to kill outstanding jobs at shutdown() like the Kuberentes one does, but the Grid Engine batch systems didn't seem to implement it.

This should fix that.

It would be nice to test this requirement across all batch systems somehow, but that's not in this.

This should fix #5082 but I think still needs some manual testing.

Changelog Entry

To be copied to the draft changelog by merger:

• Grid Engine batch systems now send the required job kills when shut down

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[adamnovak]

OK, I tested this manually, and toil kill on the job store now properly ends up with the running jobs going to the CANCELLED state in Slurm.