fix: ssn JobValid

[wangzhipeng]

JobValid after ssn.Tiers and ssn.Configurations Initialization required

OnSessionOpen to register the function jobValidFns

[volcano-sh-bot]

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[lowang-bh]

related to #2946

Need to clean up other JobValid.

[lowang-bh]

/lgtm

[lowang-bh]

@william-wang please help review it. thanks.

[hwdef]

please fix the conflict

[lowang-bh]

Hi @wangzhipeng , could we push this PR forward by solving the conflict and squash the commits?

[volcano-sh-bot]

New changes are detected. LGTM label has been removed.

[wangzhipeng]

@lowang-bh done

[lowang-bh]

@lowang-bh done

Hi, @wangzhipeng we'd better to use rebase and squash the four commits to only one. thanks.

[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[volcano-sh-bot]

@wangzhipeng: PR needs rebase.

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