Function build_release_bundle 

pub fn build_release_bundle(
    repo: &str,
    base_tag: &str,
    head_tag: &str,
    commits: &[CompareCommit],
    commit_pulls: &[GitHubCommitPullAssociation],
    artifact_attestations: EvidenceState<Vec<ArtifactAttestation>>,
) -> EvidenceBundle

Builds an evidence bundle from a release tag comparison and associated commits.