Clean up certificate leases

[skonto]

Fixes https://github.com/knative/serving/issues/15238

Proposed Changes

• See https://github.com/knative/serving/pull/15321#issuecomment-2176434523
• After deleting pods the new ones will not set any lease but we want to make sure old relics are removed.
• This is temporary until client-go lib fixes this, https://github.com/kubernetes/client-go/issues/1362.

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: skonto

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/knative/serving/blob/main/OWNERS)~~ [skonto] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.62%. Comparing base (1dff15d) to head (c3984c1). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15359 +/- ## ========================================== + Coverage 84.59% 84.62% +0.02% ========================================== Files 219 219 Lines 13584 13584 ========================================== + Hits 11492 11496 +4 + Misses 1726 1724 -2 + Partials 366 364 -2 ```

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[skonto]

/test istio-latest-no-mesh

[dprotaso]

/test all

[skonto]

/test istio-latest-no-mesh