Improve CM Cert reconcile and deletion if feature is turned off

[matzew]

Fixes #

Proposed Changes

• Improve CM Cert reconcile and deletion if feature is turned off

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 20 lines in your changes missing coverage. Please review.

Project coverage is 52.43%. Comparing base (ebd149e) to head (58582a2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/reconciler/integration/sink/integrationsink.go	58.33%	19 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8519      +/-   ##
==========================================
+ Coverage   52.38%   52.43%   +0.04%     
==========================================
  Files         397      397              
  Lines       24836    24869      +33     
==========================================
+ Hits        13011    13039      +28     
- Misses      11038    11043       +5     
  Partials      787      787              

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[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, pierDipi

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• OWNERS [matzew,pierDipi]

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