Dry run feature for all OSPO actions

[zkoppert]

Is your feature request related to a problem?

Sometimes I just want to run the tool/action without doing any harm. I'd like to be able to run in dry_run mode on any of the actions. I believe cleanowners is the only one that has it.

Related OSPO Tool

automatic-contrib-prs GitHub Action, contributors GitHub Action, internal-contribution-forks GitHub App, evergreen GitHub Action, issues-metrics GitHub Action, stale-repos GitHub Action

Describe the solution you'd like

See dry_run functionality in cleanowners action

Describe alternatives you've considered

No response

Additional context

No response

[ahpook]

I think @lelia was also interested in this

Relates to #74 ; the configuration for dry-run vs action mode should be consistently configurable