Automated cherry pick of #2079: fix volcano podgroup update issue

[tenzen-y]

Cherry pick of #2079 on v1.8-branch.

2079: fix volcano podgroup update issue

For details on the cherry pick process, see the cherry pick requests page.

[google-oss-prow[bot]]

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[tenzen-y]

/close

[google-oss-prow[bot]]

@tenzen-y: Closed this PR.

In response to [this](https://github.com/kubeflow/training-operator/pull/2136#issuecomment-2155094795): >/close > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[tenzen-y]

/reopen

[google-oss-prow[bot]]

@tenzen-y: Reopened this PR.

In response to [this](https://github.com/kubeflow/training-operator/pull/2136#issuecomment-2155095754): >/reopen Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[coveralls]

Pull Request Test Coverage Report for Build 9419664408

Details

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 35.366%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controller.v1/common/job.go	0	3	0.0%
<!--	Total:	0	3	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/mpi/mpijob.go	1	91.06%
<!--	Total:	1		-->

Totals
Change from base Build 8869266420:	-0.02%
Covered Lines:	4373
Relevant Lines:	12365

---

💛 - Coveralls