cosign
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Update end-to-end tests to use Scaffolding containers
Description
Context: https://github.com/sigstore/scaffolding/tree/main/actions/setup-sigstore-env
The fakeoidc container was reimplemented in this setup as well. We can greatly simplify the end-to-end testing bash script by leveraging the run-containers script.
Previous impl: https://github.com/sigstore/cosign/pull/4161
Note: This is necessary for testing Rekor v2.