Add MaxConcurrentReconciles to JobControllerConfiguration

[Syulin7]

add MaxConcurrentReconciles to JobControllerConfiguration

fixes: https://github.com/kubeflow/training-operator/pull/1707#discussion_r1057075176

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[Syulin7]

@johnugeorge PTAL, I will do this in training operator once this is merged.

[Syulin7]

@johnugeorge I update license, please approve running workflows, thanks.

[johnugeorge]

We can wait till https://github.com/kubeflow/training-operator/issues/1714 is completed. This will make it easy to make common changes

[Syulin7]

ok, I agree.