Support for k8s v1.25 in CI

[johnugeorge]

Adds k8s v1.25 in CI. Removed v1.22 from CI

Fixes: #1682

[coveralls]

Pull Request Test Coverage Report for Build 3379369607

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 39.561%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/mpi/mpijob_controller.go	4	77.2%

Totals
Change from base Build 3313606251:	0.0%
Covered Lines:	2342
Relevant Lines:	5920

---

💛 - Coveralls

[tenzen-y]

@johnugeorge Thanks for updating k8s version!
Can we also update the k8s go libraries version?

training-operator/go.mod

Lines 13 to 16 in 74655a1

	k8s.io/api v0.24.1
	k8s.io/apimachinery v0.24.1
	k8s.io/client-go v0.24.1
	k8s.io/code-generator v0.24.1

[terrytangyuan]

/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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