test: remove k8s 1.23 and 1.24 tests

[njtran]

Fixes #N/A

Description
At v1, we'll only need to support 1.25 as we'll rely on CEL for CRD validation which is only available 1.25+.

How was this change tested?
make presubmit

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[coveralls]

Pull Request Test Coverage Report for Build 9843919569

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 78.289%

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Totals
Change from base Build 9814787992:	0.04%
Covered Lines:	8975
Relevant Lines:	11464

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💛 - Coveralls

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ellistarn, njtran

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[ellistarn]

/lgtm