Support custom scale-up and scale-down operations for StatefulSets.

[mbobrovskyi]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Support custom scale-up and scale-down operations for StatefulSets.

Which issue(s) this PR fixes:

Fixes #3279

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Support custom scale-up and scale-down operations for StatefulSets

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mbobrovskyi
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[mbobrovskyi]

/cc @mimowo

[trasc]

/uncc

[k8s-ci-robot]

PR needs rebase.

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[k8s-ci-robot]

@mbobrovskyi: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kueue-test-multikueue-integration-main	4b13a29	link	true	/test pull-kueue-test-multikueue-integration-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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