StatefulSet pod reconciliation improvement

[j-skiba]

What type of PR is this?

/kind feature

What this PR does / why we need it:

• Explicitly removes the kueue.x-k8s.io/managed finalizer when StatefulSet pod is in a Terminating state (DeletionTimestamp != nil).
  Previously, the reconciler only checked for "Terminated" phases (Succeeded/Failed), ignoring deleting pods. This caused reliance on the generic Pod controller or timeouts to clean up finalizers, leading to significant delays in pod deletion (observed in parallel E2E tests) and potential deadlocks.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

based on #8255

Does this PR introduce a user-facing change?

NONE

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: j-skiba
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[k8s-ci-robot]

Hi @j-skiba. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[tenzen-y]

/ok-to-test

[j-skiba]

/retest