Modify slurm accounting test to check slurm state after an update.

[hgreebe]

Description of changes

• Add check that slurm state remains the same after deleting the cluster id state file

Tests

• Ran test_slurm_accounting

References

• Related to this PR: Delete cluster name state file whenever slurm accounting is configured or updated aws-parallelcluster-cookbook#2994

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[gmarciani]

Here and for the other job, could you please increase the sleep time to a dummy large number, say 3000 (as we do in other tests), so that there is clearly no risk of job changing state if the forced update takes too long?