Automated cherry pick of #2079: fix volcano podgroup update issue #2130: Refine the integration tests for the immutable PyTorchJob

[tenzen-y]

Cherry pick of #2079 #2130 on v1.8-branch.
#2079: fix volcano podgroup update issue
#2130: Refine the integration tests for the immutable PyTorchJob

I manually squashed commits and modified signs since @ckyuto signed to DCO and CLA with different email addresses.

Commit sha: 18844bd, Author: Weiyu Yen, Committer: Yuki Iwai; Expected "Weiyu Yen [email protected]", but got "Weiyu Yen [email protected]".

https://github.com/kubeflow/training-operator/pull/2134/checks?check_run_id=25949083128

[coveralls]

Pull Request Test Coverage Report for Build 9419698397

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 increased (+0.03%) to 35.414%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controller.v1/common/job.go	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/mpi/mpijob.go	1	91.06%

Totals
Change from base Build 8869266420:	0.03%
Covered Lines:	4379
Relevant Lines:	12365

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9419796281

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 increased (+0.03%) to 35.414%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controller.v1/common/job.go	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/mpi/mpijob.go	1	91.06%

Totals
Change from base Build 8869266420:	0.03%
Covered Lines:	4379
Relevant Lines:	12365

---

💛 - Coveralls

[andreyvelich]

Thank you @tenzen-y!
/lgtm
/approve

[google-oss-prow]

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