[kjobctl] Add e2e test for Slurm

[IrvingMg]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Adds e2e test in kjobctl for Slurm mode.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: IrvingMg
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