[cosigned] Remove undefined apiGroups from policy clusterrole

[vpnachev]

Summary

Remove undefined apiGroups from the ClusterRole of the policy-webhook

Ticket Link

Fixes

Release Note

Remove undefined apiGroups from cosigned policy clusterrole.

[codecov-commenter]

Codecov Report

Merging #1896 (59a8461) into main (1afff48) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1896      +/-   ##
==========================================
- Coverage   34.02%   33.99%   -0.04%     
==========================================
  Files         153      153              
  Lines        9936     9936              
==========================================
- Hits         3381     3378       -3     
- Misses       6175     6177       +2     
- Partials      380      381       +1     

Impacted Files	Coverage Δ
pkg/cosign/tuf/client.go	61.68% <0.00%> (-0.82%)	⬇️

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