Refactor entire policy validation into ValidatePolicy.

[vaikas]

Signed-off-by: Ville Aikas vaikas@chainguard.dev

Summary

Refactor the ValidatePolicy that includes the CIP level policy validation. This makes for example, cmd/tester validate the entire CIP.

Release Note

Documentation

[codecov-commenter]

Codecov Report

Merging #81 (cb0287e) into main (a05dad8) will decrease coverage by 0.02%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   58.94%   58.91%   -0.03%     
==========================================
  Files          21       21              
  Lines        2097     2091       -6     
==========================================
- Hits         1236     1232       -4     
+ Misses        799      798       -1     
+ Partials       62       61       -1     

Impacted Files	Coverage Δ
pkg/webhook/validator.go	78.27% <72.72%> (+0.14%)	⬆️

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[hectorj2f]

lgtm