Add missing common labels on kcert

[ReToCode]

Changes

• Add missing common labels on kcert
• Without these, the operator does not properly select these YAMLs

/assign @skonto

/cherry-pick release-1.14

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.25%. Comparing base (995d045) to head (146ba18).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1329   +/-   ##
=======================================
  Coverage   82.25%   82.25%           
=======================================
  Files          26       26           
  Lines        1668     1668           
=======================================
  Hits         1372     1372           
  Misses        195      195           
  Partials      101      101           

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[skonto]

/lgtm

[skonto]

Are there any other resources that need this or we are good?

[ReToCode]

Are there any other resources that need this or we are good?

I think the rest is fine, I added this YAML and just missed the labels

[ReToCode]

/cherry-pick release-1.14

[knative-prow-robot]

@ReToCode: new pull request created: #1330

In response to this:

/cherry-pick release-1.14

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