Validate issuer/subject regexp in validate webhook.

[vaikas]

Signed-off-by: Ville Aikas [email protected]

Summary

Followup to #1759 validate the issuer/subject regexp in the validating webhook + tests.

Ticket Link

Fixes

Release Note

 - validate issuer/subject in the CIP validating webhook.

[codecov-commenter]

Codecov Report

Merging #1761 (0d2e812) into main (0c232da) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1761      +/-   ##
==========================================
+ Coverage   30.55%   30.59%   +0.04%     
==========================================
  Files         143      143              
  Lines        8651     8657       +6     
==========================================
+ Hits         2643     2649       +6     
  Misses       5709     5709              
  Partials      299      299              

Impacted Files	Coverage Δ
...cosigned/v1alpha1/clusterimagepolicy_validation.go	91.89% <100.00%> (+0.46%)	⬆️

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