Add comment by `Vet` in case of no packages detected

[sudhanshutech]

Current scenario

-> When vet is installed or added as github action it generates a summary report when there is change in dependencies or packages. When there is no changes in dependencies then it will not generate that report.

Expected scenario

-> We want to display a comment by vet when the vet action runs no dependency change detected when there is no change in dependencies.

[abhisek]

@sudhanshutech Thanks. Thinking about this, I think this behaviour will probably be handled by https://github.com/safedep/vet-action

But lets keep this open till we add this feature.