[aaronlew02]

Depends on #5145

Summary

This change removes verification logic and supporting clients obsoleted by the removal of the legacy (non-new-bundle-format) verification codepath.

[codecov]

Codecov Report

❌ Patch coverage is 50.89820% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.08%. Comparing base (2ef6022) to head (099ea2f).
⚠️ Report is 907 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/cosign/cli/sign/sign.go	0.00%	12 Missing ⚠️
cmd/cosign/cli/attest.go	23.07%	10 Missing ⚠️
cmd/cosign/cli/attest/attest.go	0.00%	10 Missing ⚠️
cmd/cosign/cli/attest_blob.go	52.94%	8 Missing ⚠️
pkg/cosign/verify.go	55.55%	8 Missing ⚠️
cmd/cosign/cli/verify/verify_blob_attestation.go	81.81%	6 Missing ⚠️
cmd/cosign/cli/signcommon/common.go	0.00%	5 Missing ⚠️
cmd/cosign/cli/verify.go	50.00%	5 Missing ⚠️
cmd/cosign/cli/dockerfile.go	0.00%	3 Missing ⚠️
cmd/cosign/cli/manifest.go	0.00%	3 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5146      +/-   ##
==========================================
+ Coverage   40.10%   47.08%   +6.98%     
==========================================
  Files         155      203      +48     
  Lines       10044     9935     -109     
==========================================
+ Hits         4028     4678     +650     
+ Misses       5530     5257     -273     
+ Partials      486        0     -486     

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