Feature: give the complete dependency-diff results in the Action workflow / sign&publish the JSON results

[aidenwang9867]

This is an extended feature of ossf/scorecard#2008.

Visualizing the dependency-diffs (package names, versions, change types, etc.) between the two branches in a pull request is straightforward for users to get a quick understanding of their arriving dependencies. However, it is difficult to visualize all the information in a DependencyDiffCheckResult struct in a pull request comment, otherwise, it could be too long for users to read (imagining a giant dependency check result JSON in the PR comment without json parser).

Still, our goal is to surface Scorecard check results for those dependencies, I am considering giving the complete dependency-diff check results in the Action workflow, or maybe providing an option to sign&publish the JSON results, just like what the current Scorecard Action is doing for the original Scorecard checks running on a repo.

They might be other options or positions to surface the complete results. A similar example is CodeCov putting a clear and short table in the PR comment, and giving the detailed code coverage (line xx - line yy are not covered by tests) in the PR File Changed tag as inline code annotations.

[aidenwang9867]

complete results will be given in the annotation raw_details.