Function checkRefPolicy

checkRefPolicy(
    entry: RefEntry,
    manifest: ProvenanceManifest | undefined,
    waivers: readonly Waiver[],
    approvedBy: string | undefined,
): string | undefined
Returns a failure message when the ref's policy blocks completion.
Parameters
- entry: RefEntry
- manifest: ProvenanceManifest | undefined
- waivers: readonly Waiver[]
- approvedBy: string | undefined
Returns string | undefined