[Feature request] Allowed commits configuration

## Feature Request

### Feature description
It would be useful to have an `Allowed commits` configuration similar to the existent `Allowed branches`

One frequent scenario is running jobs on Gitlab push events, doing some changes during the Jenkins job and then commit and push the changes. This causes a job to run again, because of the new push event.
If we could have a configuration to filter commit messages we could use specific commit names or regex to not execute another job.