Use kops in periodic tests

[YurDuiachenko]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR uses a kops for periodic tests.

I’m keeping this migration intentionally incremental:

• the new kops-based tests are added first
• the old kubetest2-gce-based are not removed in this PR
• gcepd tests are intentionally not migrated in this first step

The plan is to merge this PR first, observe how the new periodic jobs behave in CI, and only then remove the old periodic flow in a separate cleanup/chore PR if the new path proves stable.

Which issue(s) this PR fixes:

#1018

Special notes for your reviewer:

NONE

Does this PR introduce a user-facing change?

NONE

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[k8s-ci-robot]

Hi @YurDuiachenko. Thanks for your PR.

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[YurDuiachenko]

fixes #1018

[YurDuiachenko]

@hdp617 can you please take a look?

[hdp617]

@hdp617 can you please take a look?

Thanks! Could you run the scripts locally and share the result?