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.

[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 27 commits behind head on main.

Additional details and impacted files

@@            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

[skonto]

@dprotaso could you merge if no objection?

[dprotaso]

/lgtm /approve

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, skonto

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[dprotaso]

@skonto do you think we need to revert any of your earlier work regarding this flake?