[release-1.16] Fix WEBHOOK_DISABLE_NAMESPACE_OWNERSHIP env-var

[knative-prow-robot]

This is an automated cherry-pick of #3107

Fixed `WEBHOOK_DISABLE_NAMESPACE_OWNERSHIP` env-var

[codecov]

Codecov Report

Attention: Patch coverage is 30.76923% with 9 lines in your changes missing coverage. Please review.

Project coverage is 78.29%. Comparing base (4af9a0d) to head (0857940).
Report is 1 commits behind head on release-1.16.

Files with missing lines	Patch %	Lines
webhook/configmaps/controller.go	40.00%	2 Missing and 1 partial ⚠️
webhook/resourcesemantics/defaulting/controller.go	25.00%	2 Missing and 1 partial ⚠️
webhook/resourcesemantics/validation/controller.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.16    #3108      +/-   ##
================================================
- Coverage         78.37%   78.29%   -0.09%     
================================================
  Files               191      191              
  Lines             11177    11186       +9     
================================================
- Hits               8760     8758       -2     
- Misses             2153     2162       +9     
- Partials            264      266       +2     

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[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, knative-prow-robot

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