Remove experimental mode from cosign attest and verify-attestation

[priyawadhwa]

Signed-off-by: Priya Wadhwa priya@chainguard.dev

Ref #2255

Release Note

Remove experimental mode from cosign attest and verify-attestation

[codecov-commenter]

Codecov Report

Merging #2458 (2fd3b4c) into main (da32b91) will increase coverage by 0.33%.
The diff coverage is 50.51%.

@@            Coverage Diff             @@
##             main    #2458      +/-   ##
==========================================
+ Coverage   30.65%   30.98%   +0.33%     
==========================================
  Files         138      138              
  Lines        8404     8469      +65     
==========================================
+ Hits         2576     2624      +48     
- Misses       5494     5505      +11     
- Partials      334      340       +6     

Impacted Files	Coverage Δ
cmd/cosign/cli/attest.go	0.00% <0.00%> (ø)
cmd/cosign/cli/options/signblob.go	0.00% <0.00%> (ø)
cmd/cosign/cli/options/verify.go	0.00% <0.00%> (ø)
cmd/cosign/cli/sign/sign.go	15.71% <0.00%> (-0.13%)	⬇️
cmd/cosign/cli/sign/sign_blob.go	0.00% <0.00%> (ø)
cmd/cosign/cli/signblob.go	0.00% <0.00%> (ø)
cmd/cosign/cli/verify.go	0.00% <0.00%> (ø)
cmd/cosign/cli/verify/verify_attestation.go	0.00% <0.00%> (ø)
pkg/cosign/keys.go	61.36% <ø> (ø)
cmd/cosign/cli/verify/verify.go	19.16% <20.00%> (+0.63%)	⬆️
... and 12 more

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[cpanato]

lgtm